21. It is ______ that he has to ask for help.

　　A. so a big job

　　B. a so big job

　　C. a such big job

　　D. such a big job

　　22. It seems good ______, but it doesn’t work ______.

　　A. in practice ; in theory

　　B. in theory; in practice

　　C. theoretical; practical

　　D. for theory; for practice

　　23. Einstein was the first to show ______ how the energy of the atom might be released.

　　A. in theory

　　B. in advance

　　C. in general

　　D. in particular

　　24. I ______ his views, although I do not agree with him.

　　A. respect

　　B. respect for

　　C. respecting

　　D. respected

　　25. We should ______ the elders and teachers.

　　A. show many respects to

　　B. show respects for

　　C. show a respect to

　　D. show much respect for

　　26. Don’t use words, expressions, or phrases ______ only to people with specific knowledge.

　　A. being known

　　B. having been known

　　C. to be known

　　D. known

　　27. ______ production up by 60%, the company has had another excellent year.

　　A. As

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