46. One of the guards_____ when the general came in, which made him very angry.

　　A. has slept B. were sleeping

　　C. slept D. was sleeping

　　47. Ted was so worn out that he just _____ down and slept for ten hours.

　　A. lied B. laid

　　C. lay D. had lain

　　48. I was _____ at the stop as long as thirty minutes.

　　A. made waiting B. kept waiting

　　C. keeping waited D. kept waited

　　49. The children _____ many times not to go near the lake.

　　A. have told B. told

　　C. have been told D. were told

　　50. Our thoughts _____ by means of words.

　　A. were being expressed B. are being expressed

　　C. are expressed D. have been expressed

　　51. ______ four years since John left school.

　　A. It was B. Those are

　　C. It is D. They have been

　　52. By the time Juan gets home, his aunt _____ for Puerto Rico.

　　A. will leave B. leaves

　　C. will have left D. left

　　53. “This is a terribly heavy box.”

　　“　_____　help you to carry it.”

　　A. I am to 　　　　　 　　 B. I will

　　C. I 　　　　　　　　　 D. I am going to

　　54.All the machines　_____by the end of the following week.

　　A. were repaired 　B. will be repaired

　　C. have been repaired 　D will have been repaired

　　55.They believed that by using computers the production of their factory _____.

　　A. will greatly increase B. would greatly increase

　　C. has greatly increased D. would be greatly increased

　　56.No sooner had they got off train _______ it started moving .

　　A. when B. than

　　C. then D. after

　　57.We can do nothing unless we _____ more information.

　　A. are given B. were to be given

　　C. will be given D. were given

　　58.Most environmental problems exist because adequate measures for preventing them _____taken in the past.

　　A. was not B. were not

　　C. were not being D. being not

　　59.The football match _____ in the afternoon.

　　A. has been held B. is being held

　　C. is going to be held D. will hold

　　60.I’ll take down your name and address in case you _____ as a witness.

　　A. will need B.will be needed

　　C. need D. are needed