21. A library with five thousand books _____ to the nation as a gift.
A. is offered B. has offered
C. are offered D. have offered
22. _____ is often the case, we have worked out the production plan.
A. Which B. When
C. What D. As
23. It is no _____ talking to him, because he will never change his mind.
A. help B. use
C. time D. way
24. The way I thought of _____ the animal was of great value.
A. protecting B. protect
C. being protected D. to protect
25. In another year or so, you _____ all about it.
A. forget B. would forget
C. have forgotten D. will have forgotten
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