36. A country must always be __________guard against spies and invaders.

　　A. in

　　B. to

　　C. with

　　D. on

　　37. We must leave the party at exactly 9: 00__________ we'11 be late for work.

　　A. for else

　　B. other

　　C. else

　　D. otherwise

　　38. He remembered clearly that he__________the book on her desk yesterday.

　　A. lied

　　B. lay

　　C. lying

　　D. laid

　　39. I don't think he is serious,__________.

　　A. do I

　　B. is he

　　C. don't I

　　D. isn't he

　　40. Cancellation of the flight __________many passengers to spend the night at the airport.

　　A. resulted

　　B. obliged

　　C. demanded

　　D. recommended

　　41.__________in a recent science competition, the three students were awarded scholarships totaling$ 21,000.

　　A. Judged the best

　　B. Judging the best

　　C. To be judged the best

　　D. Having judged the best

　　42. Everything we eat and drink contains some salt; we can meet the body's need for it from natu- ral sources without turning __________the salt bottle.

　　A. up

　　B. To

　　C. on

　　D. over

　　43. I'd rather have a room of my own, however small it is, than__________a room with someoneelse.

　　A. share

　　B. to share

　　C. sharing

　　D. to have shared

　　44. He will surely finish the job on time __________he's left to do it in his own way.

　　A. in that

　　B. so long as

　　C. in case

　　D. as far as

　　45. In my opinion, you can widen the __________of these improvements through your active partici-pation.

　　A. dimension

　　B. volume

　　C. magnitude

　　D. scope