21. ______ beautiful flowers! A. What a B. So C. What D. How 22. Scientists have more to do than to allow their imaginations to wander ______ large. A. in B. by C. with D. at 23. The prisoner ______ by this way, for there his footprints were found. A. needn’t have escaped B. must have escaped C. should have escaped D. might have escaped 24. My elder brother asks me to buy ______ newspaper for him. A. a B. a piece of C. an item of D. some 25. It is no use ______ about your past mistakes. A. to regret B. to have regretting C. to have regretted D. regretting 26. ______ you come, you will find him busy with his study. A. However B. Whenever C. Wherever D. Whatever 27. ______ passed than another hit the city. A. No sooner had one typhoon B. No sooner one typhoon had C. Hardly had one typhoon D. Hardly one typhoon had 28. Marriage is alliance of two people, one ______ never remembers birthday and the other never forgets them. A. of who B. of whom C. of which D. of them 29. If you ______ hard before, you would be a college student now. A. study B. were studying C. studied D. had studied 30. The peaceful use of atomic energy will do ______ to human beings. A. good B. well C. nicely D. better
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