20.　　 The public ______ generous in their contributions to the earthquake victims.(受害人，牺牲者) a. is　　 b. was　　 c. are　　 d. has been

19.　　 The committee (委员会) ______ over the problem among themselves for two hours.

a. has argued　　 b. has been arguing　　 c. have argued　　 d. have been arguing

18.　　 The surroundings (周围，环境) of his house ______ clean now.

a. is　　 b. are　　 c. was　　 d. were

17.　　 The gas works ______ near the city.

a. is　　 b. are　　 c. were　　 d. be

16.　　 Many a student ______ the importance of learning a foreign language.

a. have realized　　 b. has realize　　 c. have been realized　　 d. has been realized

15.　　 More than one worker ______ dismissed.

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

14.　　 One or perhaps more pages _______.

a. is missing　　 b. has been missed　　 c. are missing　　 d. was missing

13.　　 All that can be done ______.

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

12.　　 Most of his savings ______ in the Xin Hua Bank.

a. has been kept　　 b. is being kept　　 c. have kept　　 d. have been kept

11.　　 Three hours ______ enough for us to finish the task.

a. are　 b. has　 c. is　 d. were