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

a. is b. are c. have d. has

解析：选b. what 引导的主语从句作主语时，谓语动词要根据后面的名词的数来决定，此处要用非第三人称单数形式。

12. the whole family _______ tv attentively. z0@THvZA}Q+: |R= [此资料转贴于学习网高考频道高考英语 ]http://www.Gzu521.Comz0@THvZA}Q+: |R=

a. are watching b. is watching

c. is seeing d. are seeing

解析：选a.此处family指家里的各个成员，所以谓语动词要用非第三人称单数形式。

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

a. was b. were c. have been d. would be

解析：选a. 此处nothing句子的主语，谓语动词要用第三人称单数形式。

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

解析：选a. 此句为倒装句，句子的主语是a soldier and two young people.

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

解析：选b. 此处主语law and order 指的是同一个概念，所以谓语动词要用第三人称单数形式.

16. there ______ little change in that middle school.

a. have b. had c. have been d. has been

解析：选d. 此处there be结构中的主语little change是不可数名词。

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

a. going to be b. / c. is d. that

解析：选c. 本句是主语从句，缺谓语，所以要用第三人称单数形式。

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

a. is covered b. is covering

c. were covered d. are covered

解析：选a. 本句缺谓语，主语percent后面是不可数名词，所以要用第三人称单数形式。

19. the following ______ some other mental diseases.

a. being b. are c. was d. were

解析：选b. 本句的表语是复数形式，所以谓语动词要用非第三人称单数形。

20. not only you but also i ______ able to help him out.

a. are b. is c. am d. were

解析：选c. 根据就近一致性原则，谓语用am。