17. (1) --- ______ was it ____ they discovered the entrance to the underground palace?

　　 --- Totally by chance.

　 (2) --- _____ was it _____ they discovered at the entrance to the underground palace?

　　 --- A helmet.

A. What, that　　　　　　　 B. How, that　　　　　　　 C. When, how　　　　　　 D. Where, that

16. (1) Never _____ time come again.

　 (2) Never _____ he _____ a single sheep.

A. has … (lost)　　　　　　 B. will … (lose)　　　　　　　　　 C. will … (lost)　　　　　　 D. lose

15. (1) It was only with the help of the local guide ____.

　 (2) It was snowing heavily _____.

　 (3) Only with the help of the local guide _______.

A. was the mountain climber rescued　 　　　　　　　　　　 B. then the mountain climber was rescued

　 C. when the mountain climber was rescued　 　　 D. that the mountain climber was rescued

14. (1) Time should be made good use of _____ our lessons well.

　 (2) Time should be spent _____ English by everybody at present.

A. learning　　　　　　　　 B. learned　　　　　　　　　 C. to learn　　　　　　　　　 D. having learned

13. (1) --- What do you think made the woman so upset?　　　　　　 --- ____ weight.

(2) --- What can I do to join in the league?　 　　　　　　　　　　　 --- _____ weight.

A. As she put on　　　　　 B. Put on　　　　　　　　　　 C. Putting on　　　　　　　 D. Because of putting on

(3) --- Why are the students so diligent these days?　　　 --- _______ the entrance exams.

A. Pass　　　　　　　　　　　　 B. To pass　　　　　　　　　 C. Passing　　　　　　　　　 D. Having passed

12. (1) The research is so designed that once _____ nothing can be done to change it.

A. begins 　　　　　　　　　 B.　 having begun　　　 C. beginning　　　　　　　　　　　 D. begun

　(2) _____ in the queue for almost half an hour, he suddenly realized that he forgot his code.

　　　 A. Having waited B. Waited　　　　　　　　　 C. To wait　　　　　　　　　　　　　 D. Waiting

11. (1) _____ in thought, he almost ran into the car in front of him.

(2) _____ his lovely dog, he looked for it everywhere.

(3) _____ his dog, he took it in the scary bushes.

A. Losing　　　　　　　　 B. Having lost　　　　　　 C. Lost　　　　　　　　　　　　　　　 D. To lose

10. (1) Not only_____ the jewelry she ____ been sold for her son’s gambling debts but also

　her house.

(2) Never _____ he come unless he _____ his wallet back.

A. will, has 　　　　　　　　 B. has, had 　　　　　　　 C. has, has　　　　　　　　　　　　 D. /, has

9. (1) The man is fond of _____ the most popular songs in our city.

(2) The man whose songs we are fond of ______ in our city next week.

A. singing 　　　　　　　　　 B. to sing　　　　　　　　　　 C. will sing 　　　　　　　　　　　 D. sang

8. (1) Are you talking about _____ the new school next week?

　 (2) The person we talked about _______ our school last week.

A. visiting　　　　　　　　 B. will visit　　　　　　　　　 C. visited　　　　　　　　　　 D. has visited