17. The professor referred to　　　　 　yesterday.

　 A. come　　　　　 B. came　　　　　 C. coming　　　　　 D. comes

16. Though we spent a lot, we think it ______ because we succeeded in the end.

A. worth　　　 B. reasonable　　 C. beneficial　　 D. worthwhile

15.　 Don’t spoil the children. Can’t you make your little son ______ himself?

A. behave　　　 B. believe　　　 C. perform　　　 D. conduct

14. Tom is ______ because he never takes any exercise.

A. under conditions　 B. on no condition　 C. in condition　 D. out of condition

13. We went to the concert ______ my son, for he would perform there.

A. in search of　 B. in charge of　 C. in honor of　 D. in support of

12. It is the test system, _____ the teachers, that is to blame for the heavy burden of middle school students nowadays.

A. other than　 B. or rather　　 C. rather than　 D. more than

11. The newly-published book, which ______ basic English grammar, is _____ only for beginners.

A. regards as, meant　 B. crowds in, intended　 C. builds up, planned　 D. refers to, intended

10. Having a cell-phone also makes us feel safer, since we can call for help in case of an _________.

A. accident　　　　 B. emergency　　　　　 C. escape　　　　　　　 D. incident

9. To the surprise of many people, in ten years the city's population _______ by 12%.

　 A. gained　　　 B. expanded　 C. developed　　 D. spread

8. Green products are becoming more and more popular because they are environmentally _______.

A. friendly　　 B. various　　 C. common　　　 D. changeable