21. Unfortunately, the package I was expecting was _____ to the wrong address.
A. written B. given
C. packed D. delivered
22. _____by a large audience, he felt very nervous and didn't know what to say.
A. Watching B. Watch
C. Watched D. Having watched
23. I'm very grateful for your help and hope to do something for you_____in the future.
A. in exchange B. instead
C. in return D. in particular
24. I can ____you that the animals are well cared for in our zoo, so you needn't worryabout them.
A. suppose B. assume
C. assure D. grant
25. The drowning boy made a _____ attempt to catch the ropethrown to him.
A. dangerous B. graceful
C. gentle D. desperate
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