题目内容：

大学英语选择题求答案
Vocabulary and Structure
Directions: Choose the best one to complete each sentence.
11. Operations which left patients __________ and in need of long periods of recovery time now leave them feeling relaxed and comfortable.
A. exhausted
B. abandoned
C. injured
D. deserted
12. It is important that the hotel receptionist __________ that guests are registered correctly.
A. has made sure
B. made sure
C. must make sure
D. make sure
13. I'll never forget ___________ you for the first time.
A. to meet
B. meeting
C. to have met
D. having to be meeting
14. That young man still denies __________ the fire behind the store.
A. start
B. to start
C. having started
D. to have started
15. __________ in a recent science competition, the three students was awarded scholarships (奖学金) totaling $21, 000.
A. Judged the best
B. Judging the best
C. To be judged the best
D. Having judged the best
16. Everything we eat and drink contains some salt; we can meet the body's need for it from natural sources without turning _________ the salt bottle.
A. up
B. to
C. on
D. over
17. He always did well at school ___________ having to do part-time jobs every now and then.
A. in spite of
B. regardless of
C. on account of
D. in case of
18. ___________ receiving financial support from family, community or the government is allowed, it is never admired.
A. As
B. Once
C. Although
D. Lest
19. The basic features of the communication process are identified in one question: Who says __________ through what channel to whom?
A. how
B. when
C. what
D. such
20. The hours _________ the children spend in their one-way relationship with television people undoubtedly affect their relationships with real-life people.
A. in which
B. on which
C. when
D. that