1.Ho Chi Minh's Mausoleum in HN was visited by Lan and Maryam.

2.Maryam was taken to Hoan Kiem Lake by Lan.

3.The cake was cut cleverly.

4.C1:We was given a lot of presents by the teacher.

C2:A lot of presents was given to us by the teacher. 

5.She was made run away by him.

6.He was made study hard for the exam by his parents.

7.The ao dai has been mentioned in poem by poets.

8.Lines of poetry on the ao dai have been printed by some fashion designers.

9.The symbols have been added to the ao dai by some fashion designers.

10.Two department stores have been built this year.

11.Mary hasn't been seen since 3 o'clock.

12.The first prize has just been won by Trang.

13.The Internet has been used for education in recent years.

14.The washing machine has been designed by famous engineers.

15.This work must be done right away.

16.A new station will be built here.

17.I think this room should be decorated again by him. 

18.This letter should be sent by you before Saturday.

19.The report has to be finished today.