Exercise 8: 

1. not attractive as

2. as beautiful as

3. is not dangerous as

4. is not expensive as

5. different from

6. different from

7. is not as same

8. is not luxurious as

9. different from

10. as important as

Exercise 9: 

1. Has been use

2. is discovered

3. has been widened

4. was finished 

5. situates

6. was built

7. was completed

8. was formed

9. was opened

10. 

Exercise 10: 

1. The wheel was invented thousands of years ago.

1 plesure

2 same

3 pressure

4 orange

5 near

Exercise 2

1 chopsticks

2 waiter

3 menu

4 fry

5 peel

6 cheapest

7 at

8 care

9 rest

10 most 

Exercise 4

1 an

2 some

3 any

4 an

5 some

Exercise 3

1 am listening

2 are playing

3 are eating

4 is writen

5 is cleaning

Exercise 3

1 am listening

2 are playing

3 are eating

4 is written

5 is cleaning

Exercise 4

1 an

2 some

3 any

4 an

5 some

Exercise 8: 

1. not as attractive as

2. as beautiful as

3. is not as dangerous as

4. is not expensive as

5. different from

6. different from

7. is not as same

8. is not luxurious as

9. different from

10. as important as

Exercise 9: 

1. Has been used

2. is discovered

3. has been widened

4. was finished 

5. situates

6. was built

7. was completed

8. was formed

9. was opened

Exercise 10: 

1 pleasure

2 same

3 pressure

4 orange

5 near

Exercise 2

1 chopstick

2 waiter

3 menu

4 fry

5 peel

6 cheapest

7 at

8 care

9 rest

10 most