20. Not only you but also I ______ able to help him out.

　　　 A. are　　　　 　　　B. is　　　　 　C. am　　　　 D. were

19. The following ______ some other mental diseases.

　　　 A. being　　　 　　　B. are　　　 　　C. was　　　 　D. were

18. Seventy-five percent of the earth’s surface ______ with water.

　　　 A. is covered　　　　 B. is covering　　 C. were covered　　　　　　 D. are covered

17. What such a sunset is ______ strange to us all.

　　　 A. going to be　　　 B. /　　 　　　　　C. is　　　 D. that

16. There ______ little change in that middle school.

　　　 A. have　 　　　　　 B. had　 　　　　　C. have been　　　 　　　D. has been

15. If law and order ______, neither the citizen nor his family is safe.

　　　 A. are not preserved　 　　　　B. is not preserved

　　　 C. were preserved　　　 　　　D. have not been preserved

14. At the bus stop ______ a soldier and two young people on their way to the village.

　　　 A. were　　 　　　B. was　　 　　　　C. is　 　　　　　　　D. sits

13. Nothing but several glasses ________ bought by my father the day before yesterday.

　　　 A. was　 　　　　　B. were　 　　　　C. have been　 　　　　D. would be

12. The whole family _______ TV attentively.

　　　 A. are watching　　　　　　 B. is watching　　　 C. is seeing　　　　　　　　　　 D. are seeing

11. What the children in the mountain village need ________ good books.

　　　 A. is　　　　　　　 　 B. are　　 　　　　C. have　　　　　 　　　 D. has