IV.Choose the best answer. (A , B, C or D ) 15. It is hard to explain …..the phone. A. in B. at C. on D. of 16. Tet is the most important festival in Viet Nam;………….,most Viet Nam return home for Tet. A. but B. therefore C. however D. otherwise 17.We don’t have many carnivals in Viet Nam; …………….we have many traditional festivals. A. also B. But C. moreover D. nevertheless 18.Bin loves ……..Trung cakes A. making B. makeing C. make D. made 19. We want to reduce pollution but we also want to enjoy convenience that .............science and technology supply us. A. a B. an C. the D. no article 20. The cost of …….is very high in the big city. A. live B. lived C. lives D. living 21.I stopped ……my book and went to bed A. to read B. reading C. read D. reads 22.Yoga helps us learn ……..to co-ordinate breathing and movement. A. What B. When C. Why D. How 23………should children do yoga too? A. Why B. When C. What D. How 24. Don’t worry. It is …….to travel to that village even at night. A. safe B. unsafe C. difficult D. inconvenience 25. We have to …..our shoes when we go inside a pagoda. A. take off B. give off C. turn off D. put on 26. Would you like to go …..a walk ….. the park this afternoon. A. to/at B. for/at D. to/in D. for /in 27.The bus was very ……this morning. We can’t go to the church. A. crowed B. crowded C. full D. busy