B. I don't know what to doing make my mother happy.
C. I don't know what to do to make my mother happy.
D. I don't know what doing to make my mother happy.
19. engine/car/ need/ clean/ once/ month/.
A. The engine for the car need to clean once a month.
B. The engine of the car needs cleaning once a month.
C. The engine with the car needs to be cleaned once a month.
D. The engine of the car needs to clean once a month.
20. many/place/ the world/,/people/used/ dye/ cloth/ nature/ material/.
A. In many places in the world, people used dyeing cloth by natural materials.
B. In many places in the world, people used to dye cloth with natural materials.
C. In many places in the world, people used to dyeing cloth by natural materials.
D. In many places in the world, people used to dye cloth with nature materials.
21. book/I/just/read/interesting/.
A. The book whom I have just read is interesting.
C. The book which I had just read is interesting.
22. Although / he/tired / he / have to/finish/homework/.
A. Although he is tired, he have to finish the homework.
B. Although he is tired, he has to finish his homework.
C. Although he tired, he has to finish the homework.
D. Although he was tired, he has to finish his homework.
23. Children / should have / special day / express / feeling / memories//love/their parents/.
A. Children should have a special day expressing their feeling, memories and love to their parents.
B. Children should have a special day express their feeling, memories and love for their parents.
C. Children should have a special day to express their feeling, memories and love for their parents.
D. Children should have a special day expressing their feeling, memories and love for their parents.
24. It/be/ necessary / have a day / celebrate / our parents/.
A. It is necessary to have a day for celebrate for our parents.
B. It is necessary to have a day to celebrate for our parents.
C. It is necessity to have a day to celebrate for our parents.
D. It is necessary to have a day to celebrate to our parents.
25. It/ be claimed/ The Cham towers/ Binh Dinh province/ biggest/ Southeast Asia/.
iggest in Southeast Asia.
B. The book who I have just read is interesting.
D. The book which I have just read is interesting.