1.

-> Rice is grown in tropical countries.

2.

-> English is being learned at school now.

3.

-> Many souvenirs have been bought from a trip to Ha Long Bay by mother.

4. 

-> Green trees have been being planted along the streets recently by my class.

5. 

-> A letter was sent to Nam yesterday.

6.

->Spring rolls were being made by Mrs. Robinson at this time last night.

7.

-> I had been taken to the zoo by my parents.

8.

-> A tall building will be built here next year.

9.

-> A small party will being held by my friends at home at 7 tomorrow evening.

10.

-> Songs can be composed very well by Tom.

11. 

-> She is going to be invited to the party.

12.

-> Those words can't be pronounced.

13.

-> That picture is going to be painted.

14.

-> That bike wasn't sold for us.

15.

-> The homework is being done at present.

16.

-> The classroom hasn't been decorated.

17.

-> The bike wasn't repaired last week.

18.

-> A bag wasn't being carried to the market by Mrs. Nga.

19.

-> What are computers used? 

20.

-> Where were comics bought?

21. 

-> How can this exercise be done?

22.

-> Why have they been taken part in this club?