diff --git a/index.js b/index.js
index 3df06ec1..0fc880ef 100644
--- a/index.js
+++ b/index.js
@@ -8,6 +8,11 @@
  */
 function trimProperties(obj) {
   // ✨ implement
+  const result = {}
+  for (let prop in obj) {
+    result[prop] = obj[prop].trim()
+  }
+  return result
 }
 
 /**
@@ -20,6 +25,10 @@ function trimProperties(obj) {
  */
 function trimPropertiesMutation(obj) {
   // ✨ implement
+  for(let prop in obj){
+    obj[prop] = obj[prop].trim()
+  }
+  return obj
 }
 
 /**
@@ -32,6 +41,13 @@ function trimPropertiesMutation(obj) {
  */
 function findLargestInteger(integers) {
   // ✨ implement
+  let result = integers[0].integer 
+  for(let i = 0; i < integers.length; i++){
+    if(integers[i].integer > result){
+      result = integers[i].integer
+    }
+  }
+  return result
 }
 
 class Counter {
@@ -41,6 +57,7 @@ class Counter {
    */
   constructor(initialNumber) {
     // ✨ initialize whatever properties are needed
+    this.count = initialNumber
   }
 
   /**
@@ -57,6 +74,7 @@ class Counter {
    */
   countDown() {
     // ✨ implement
+    return this.count > 0 ? this.count -- : 0
   }
 }
 
@@ -66,6 +84,8 @@ class Seasons {
    */
   constructor() {
     // ✨ initialize whatever properties are needed
+    this.seasons = ['summer', 'fall', 'winter', 'spring']
+    this.currentSeason = 0
   }
 
   /**
@@ -82,6 +102,13 @@ class Seasons {
    */
   next() {
     // ✨ implement
+    const result = this.seasons[this.currentSeason]
+    if(this.currentSeason === 3){
+      this.currentSeason = 0 
+    }else{
+      this.currentSeason++
+    }
+    return result
   }
 }
 
@@ -96,6 +123,8 @@ class Car {
     this.odometer = 0 // car initilizes with zero miles
     this.tank = tankSize // car initiazes full of gas
     // ✨ initialize whatever other properties are needed
+    this.tankSize = tankSize
+    this.mpg = mpg
   }
 
   /**
@@ -113,6 +142,15 @@ class Car {
    */
   drive(distance) {
     // ✨ implement
+    const milesDriveable = this.tank * this.mpg
+    if(distance <= milesDriveable){
+      this.odometer = this.odometer + distance
+      this.tank = this.tank  - (distance / this.mpg)
+    }else{
+      this.tank = 0
+      this.odometer = this.odometer + milesDriveable
+    }
+    return this.odometer
   }
 
   /**
@@ -128,6 +166,13 @@ class Car {
    */
   refuel(gallons) {
     // ✨ implement
+    const tankGallons = this.tankSize - this.tank
+    if(gallons <= tankGallons){
+      this.tank  = this.tank + gallons
+    }else{
+      this.tank = this.tankSize
+    }
+    return this.tank * this.mpg
   }
 }
 
@@ -144,9 +189,13 @@ class Car {
  *    // result is false
  * })
  */
-function isEvenNumberAsync(number) {
-  // ✨ implement
-}
+async function isEvenNumberAsync(number) {
+  if(!number || typeof number !== "number"){
+    return false
+  } 
+  if(number % 2 === 0) {return true }
+    else{return false}
+  }
 
 module.exports = {
   trimProperties,
diff --git a/index.test.js b/index.test.js
index cfb0a0b3..6e417696 100644
--- a/index.test.js
+++ b/index.test.js
@@ -8,16 +8,35 @@ describe('[Exercise 1] trimProperties', () => {
     const actual = utils.trimProperties(input)
     expect(actual).toEqual(expected)
   })
-  // test('[2] returns a copy, leaving the original object intact', () => {})
+  test('[2] returns a copy, leaving the original object intact', () => {
+    const input = { name: '   cynthia   ' }
+    const expected = { name: 'cynthia' }
+    expect(utils.trimProperties(input)).toEqual(expected)
+    expect(utils.trimProperties(input)).not.toBe(input)
+  })
 })
 
 describe('[Exercise 2] trimPropertiesMutation', () => {
-  // test('[3] returns an object with the properties trimmed', () => {})
-  // test('[4] the object returned is the exact same one we passed in', () => {})
+  test('[3] returns an object with the properties trimmed', () => {
+    const input = { foo: '  foo ' }
+    const actual = utils.trimPropertiesMutation(input)
+    const expected = { foo: 'foo' }
+    expect(expected).toEqual(actual)
+  })
+  test('[4] the object returned is the exact same one we passed in', () => {
+    const input = { foo: '  foo ', bar: 'bar ', baz: ' baz' }
+    const expected = { foo: 'foo', bar: 'bar', baz: 'baz' }
+    const actual = utils.trimProperties(input)
+    expect(actual).toEqual(expected)
+  })
 })
 
 describe('[Exercise 3] findLargestInteger', () => {
-  // test('[5] returns the largest number in an array of objects { integer: 2 }', () => {})
+  test('[5] returns the largest number in an array of objects { integer: 2 }', () => {
+    const input = [{ integer: 1 }, { integer: 2 }, { integer: 3 }]
+    const invoked = utils.findLargestInteger(input)
+    expect(invoked).toBe(3)
+  })
 })
 
 describe('[Exercise 4] Counter', () => {
@@ -25,9 +44,20 @@ describe('[Exercise 4] Counter', () => {
   beforeEach(() => {
     counter = new utils.Counter(3) // each test must start with a fresh couter
   })
-  // test('[6] the FIRST CALL of counter.countDown returns the initial count', () => {})
-  // test('[7] the SECOND CALL of counter.countDown returns the initial count minus one', () => {})
-  // test('[8] the count eventually reaches zero but does not go below zero', () => {})
+  test('[6] the FIRST CALL of counter.countDown returns the initial count', () => {
+    expect(counter.countDown()).toBe(3)
+  })
+  test('[7] the SECOND CALL of counter.countDown returns the initial count minus one', () => {
+    counter.countDown()
+    expect(counter.countDown()).toBe(2)
+  })
+  test('[8] the count eventually reaches zero but does not go below zero', () => {
+    counter.countDown()
+    counter.countDown()
+    counter.countDown()
+    counter.countDown()
+    expect(counter.countDown()).toBe(0)
+  })
 })
 
 describe('[Exercise 5] Seasons', () => {
@@ -35,12 +65,37 @@ describe('[Exercise 5] Seasons', () => {
   beforeEach(() => {
     seasons = new utils.Seasons() // each test must start with fresh seasons
   })
-  // test('[9] the FIRST call of seasons.next returns "summer"', () => {})
-  // test('[10] the SECOND call of seasons.next returns "fall"', () => {})
-  // test('[11] the THIRD call of seasons.next returns "winter"', () => {})
-  // test('[12] the FOURTH call of seasons.next returns "spring"', () => {})
-  // test('[13] the FIFTH call of seasons.next returns again "summer"', () => {})
-  // test('[14] the 40th call of seasons.next returns "spring"', () => {})
+  test('[9] the FIRST call of seasons.next returns "summer"', () => {
+    expect(seasons.next()).toBe('summer')
+  })
+  test('[10] the SECOND call of seasons.next returns "fall"', () => {
+    seasons.next()
+    expect(seasons.next()).toBe('fall')
+  })
+  test('[11] the THIRD call of seasons.next returns "winter"', () => {
+    seasons.next()
+    seasons.next()
+    expect(seasons.next()).toBe('winter')
+  })
+  test('[12] the FOURTH call of seasons.next returns "spring"', () => {
+    seasons.next()
+    seasons.next()
+    seasons.next()
+    expect(seasons.next()).toBe('spring')
+  })
+  test('[13] the FIFTH call of seasons.next returns again "summer"', () => {
+    seasons.next()
+    seasons.next()
+    seasons.next()
+    seasons.next()
+    expect(seasons.next()).toBe('summer')
+  })
+  test('[14] the 40th call of seasons.next returns "spring"', () => {
+    for(let i = 0; i < 39; i++){
+      seasons.next()
+    }
+    expect(seasons.next()).toBe('spring')
+  })
 })
 
 describe('[Exercise 6] Car', () => {
@@ -48,13 +103,41 @@ describe('[Exercise 6] Car', () => {
   beforeEach(() => {
     focus = new utils.Car('focus', 20, 30) // each test must start with a fresh car
   })
-  // test('[15] driving the car returns the updated odometer', () => {})
-  // test('[16] driving the car uses gas', () => {})
-  // test('[17] refueling allows to keep driving', () => {})
-  // test('[18] adding fuel to a full tank has no effect', () => {})
+  test('[15] driving the car returns the updated odometer', () => {
+    expect(focus.drive(100)).toBe(100)
+    expect(focus.drive(100)).toBe(200)
+    expect(focus.drive(100)).toBe(300)
+    expect(focus.drive(200)).toBe(500)
+  })
+  test('[16] driving the car uses gas', () => {
+    focus.drive(600)
+    expect(focus.drive(1)).toBe(600)
+    expect(focus.drive(1)).toBe(600)
+    expect(focus.tank).toBe(0)
+  })
+  test('[17] refueling allows to keep driving', () => {
+    focus.drive(600)
+    focus.refuel(10)
+    focus.drive(600)
+    expect(focus.odometer).toBe(900)  
+    focus.refuel(20)
+    focus.drive(600)
+    expect(focus.odometer).toBe(1500)
+  })
+  test('[18] adding fuel to a full tank has no effect', () => {
+    focus.refuel(2000000)
+    focus.drive(10000)
+    expect(focus.odometer).toBe(600)
+  })
 })
 
 describe('[Exercise 7] isEvenNumberAsync', () => {
-  // test('[19] resolves true if passed an even number', () => {})
-  // test('[20] resolves false if passed an odd number', () => {})
+  test('[19] resolves true if passed an even number', async () => {
+    let result = await utils.isEvenNumberAsync(4)
+    expect(result).toBe(true)
+      })
+     test('[20] resolves false if passed an odd number', async () => {
+       let number = await utils.isEvenNumberAsync(5)
+       expect(number).toBe(false)
+     })
 })
diff --git a/package-lock.json b/package-lock.json
index 880aab90..db97e7ae 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,7 +5,6 @@
   "requires": true,
   "packages": {
     "": {
-      "name": "node-testing1-project",
       "version": "1.0.0",
       "devDependencies": {
         "@types/jest": "^27.0.3",