11. She is a kind girl.
=> What a kind girl !

12. That is a nice surprise.
=> What a nice surprise!

13. These are expensive rings.
=> What expensive rings!

15. People put many kinds of newspapers on the table.
=> Many kinds of newspapers are put on the table.
16. Tom must write this essay.
=> This essay must be written by Tom
17. My father has just bought a lot of new book.
=> A lot of new books have just been bought by My father
18. People will publish this novel in Ferbruary.
=> This novel will be published in Ferbruary.
19. They are building a new hotel.
=> A new hotel is being built
20. Betty has just sent Mai many postcards.
=> Mai has just been sent many postcards by Betty
21. Hoa is going to send to her mother a gift.
=> Hoa's mother is going to be sent a gift.
22. They will building many new school in the future.
=> Many new schools will being built in the future.
23. Students must write the answers in ink.
=> The answers must be written in ink by students
24. He wrote all the songs on this new album.
=> All the songs were written on this new album.
26. We must solve this problem soon.

=> This problem must be solved soon

27. Nguyen Du wrote Truyen Kieu.

=> Truyen Kieu was written by Nguyen Du.