1 the letters are delivered by Mr hai everyday

2 the tickets are often bought at the box office 

3 their homework is usually finished before bed time

4 our exercises are corrected by the teacher today

5 the shows of music are often watched on TV

6 A written test is often done today

7 the picasso's exhibition is always seen 

8 the streets are cleaned by the workers everyday

9 many accidents are caused by careless driving

10 the river bank is covered by weeds

II.1 that nolvel was written by Mrs Allen in 1998

2 The reference book from the shelf was borrowed by Nam yesterday

3 Two loaves of bread were eaten by the boy last sunday

4 the letter on the desk was left some minutes ago

5 A new bike was bought for me by my mother last moth

6 Our written test was returned to us by our form teacher last lesson

7 trees were planted in their neighborhood by Vietnamese a year ago

8 games were played yesterday

9 the housework was done by my sister yesterday

10 his book was published by the publisher in 1996

11 our desk was repaired during the weekend

12 the novel"Martin Idon" was written by Jack london

III.1 I am too excited to do anything

2 Lan is glad to see her old friend again

3 the students are worried to hear the new information

4 she is strong enough to carry all those heavy bags

5 Tam is intelligent enough to finish the test for an hour

6 he was too sick to go to school yesterday

7 ba is delighted to receive his close friend's letter

8 the children is happy to get toys from Santa Claus in Christmas

9 I am delighted to receive your massage

10 She is smart enough to answer all the questions

11 He is anxious to wait for the test results