immediately; contributed to

　　B. direct; contributed to C. directly; attributed to D. direct; attributed to

　　19. Scientists are convinced _____ the positive effect of laughter _____ physical and mental health.

　　A. of; at

　　B. by; in

　　C. of; on

　　D. on; at

　　20. Only after my friend came _________.

　　A. did the computer repair

　　B. has he repaired the computer

　　C. was the computer repaired

　　D. had the computer been repaired

　　21. Most of what has been said about the Smiths ____ also true of the Johnsons.

　　A. are

　　B. is

　　C. being

　　D. to be

　　22. If you try to learn too many things at a time at the beginning, you may _____.

　　A. have confused

　　B. get confused

　　C. get confusing

　　D. have to be confused

　　23. The experts advise _____ our army_____ modern weapons.

　　A. to equip; with

　　B. equipping; with

　　C. to equip; for

　　D. equipping; for

　　24. The manager, ______ it clear to us that he didn’t agree with us, left the meeting room.

　　A. to making

　　B. to make

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