BT 3:

1. My house is made from wood.

2. These eggs aren't laid by my hens.

3. Morning exercises are done by Jim every day.

4. The dogs are fed by Jane every day.

5. Letters are delivered by the mailman every day.

6. Vegetables are grown in the fields by the farmer.

7. Cattle are raised by farmworkers.

8. Many diseases are cured by surgery nowadays.

9. National heritages are preserved by the government.

10. The architectural features of the house are carefully studied by the architects.

BT 4

1. C

2. C

3. A

4. C

5. A

6. C

7. C

8. C

9. A

10.A

BT 5

1. was finished

2. was caused

3. was drunk

4. was prepared

5. wasn't opened

6. was cut

7. was sentenced

8. was sent

9. were made

10. was found

11. were sung

12. were set off

13. were rescued

14. were you bear

15. were sell out

16. was thrown

17. was your house built

18. wasn't recognized

19. was surprised

20. was witnessed 

bài tập 4:

1:d

2:c

3:c

4:a

5:d

6:b

7:b

8:c

9:a

10:c

mình không biết làm nhưng bài còn lại