16. 

1. Is the car cleaned in the garage by your father?

2. were => was

3. purchase => purchased

4. lay => laid

5. is => was

6. Did => Was

7. worked => working

8. The tower was built by a famous architect in 1990.

9. with => by

10. Did you walk to school when you were a child?

bai 17

1. were demolished

2. was constructed

3. is located

4. are preserved

5. is regared

6. was completed

7. are sold.

8. were visited

9. Was Jim invited

10. were solved

bai 18

1. am not permitted

2. makes

3. is expected

4. doesn't let

5. was paid

6. was designed

7. was rumoured

8. ordered

9. are often shined

10. is lighted

11. Did your health worsen

12. promised

13. were covered

14. often make

15. was moved.

bài 17 

1/ is visiting

2/ preserving

3/ located

4/ inviting

5/ is solved

6/ has completed

7/ selling