1/

1 arrived

2 worked

3 spent

4 did/return

5 did not have

6 did talk

7 was/played

8 was

9 used to work

2/

1 the letter was designed by the director

2 the classrooms are cleaned everyday

3 the lesson is being explained by my teacher now

4 the bridge will be completed by the workers next year

5 he was given a new car by his father

6 that story was written by the artist

7 English is spoken today

8 these books were returned to the libary

9 that textbooks will be bought

10 that dress is worn by your mother

3/

1 work->worked

2 bỏ the

3 for->to

4 have visited-> visited

5 were built-> built

II.

1. The letter was signed by the director.
2. The classrooms were leaned everyda.y
3. The lesson is being explained by my teacher now.
4. The bridge will be completed next year.
5. A new car has been given to him by his father.
6.That story was written by an artist.

7. Today English is spoken by a large number of people.
8. Were these books returned to the library ?
9. Will the textbook be bought ?
10. Is that dress worn by your mother ?

III.

1. work ⇒ worked
2. did ⇒ do
3. for ⇒ to
4. have ⇒ had
5. were ⇒ ∅