16. Helen is much more kind to her youngest child than to the others,___________ of course, make the others unhappy.

　　A. who B. which C. she D. that

　　17. --Could I use your bike, Jack?

　　--Of course, you____________.

　　A. can B. may C. could D. might

　　18. We must keep our room clean. Dirt and disease go___________, you know.

　　A. from time to time B. hand in hand

　　C. step by step D. one after another

　　19. During the ten-day vacation, they traveled to France their own expense___________

　　A. on B. with C. at D. in

　　20. If human beings had been a bit less greedy and cruel, more birds and animals___________dying out.

　　A. ought to avoid B. could have been avoided

　　C. should have avoided D. might have avoided

　　21. We liked the oil painting better____________ we looked at it.

　　A. as B. while C. the D. the more

　　22. I don't skate now, but I___________ when I was a kid.

　　A. used to B. am used to it C. sued D. used to do

　　23. He didn't seem to mind_____________ TV while he was trying to study

　　A. them to watch B. that they watch

　　C. their watching D. watching

　　24. Flight BA 123 to Vienna is now boarding at

　　A. Gate 21 B. 21St Gate C. the Gate 21 D. 21 Gate

　　25. --Did you enjoy yourself yesterday?

　　--Yes. As you saw , ________ party went on in____________ most pleasant atmosphere.

　　A. the; a B. the; the C. a; the D. a; a

　　26. -He isn't particular about his food.

　　-Yes, he eats_____________ anything.

　　A. nearly B. mostly C. almost D. possibly

　　27. You____________ this morning if you really wanted to see it yourself.

　　A. ought to come B. mostly C. almost D. possibly

　　28. __________ you understand the rule, you will have no further difficulty.

　　A. While B. Once C. Though D. Unless

　　29. --Whose advice do you think I should take?

　　--___________.

　　A. You speak B. That's it

　　C. It's up to you D. You got it

　　30. Jack is one of those men who_________ best evening the most difficult situations.

　　A. his B. your C. their D. one's