Jack almost fell off the cliff, but managed to _____ until help came.

　　 A. keep on   B. catch on  C. count on    D. hang on

When I took his temperature, it was two degrees above _____.

　　A. average    B. ordinary    C. regular    D. normal

Roses are quite _____ flowers in English gardens.

　　A. ordinary    B. common    C. usual    D. general

Despite their good service, most inns are less costly than hotels of _____ standards.

　　A. equivalent    B. uniform    C. alike    D. likely

For some people, the sight of a mouse can be reason to scream. For other mice, the same sight can be reason to sing.

    Mice will probably   21   sing their way to any concert, but researchers in the United States have found   22   that mice do,   23  , sing.

    Scientists already knew that mice make ultrasonic(超声波) sounds—noises that are too high-pitched(高音的) for people to hear   24   special equipment.

    To find out whether mice put such sounds together in song-like   25  , the researchers recorded the sounds of 1 mice. Using computer   26  , they were able to separate the sounds into specific types of syllables(音节), and found the mice produced about 10 syllables per second.

    The results showed that nearly all of the mice repeated sequences(顺序) of syllables in different patterns. That’s enough to meet the definition of what scientists   27   song. But not all scientists are   28  _ that what the mice are doing is   29   singing. To prove it, the researchers must show that there’s learning involved. And, they need to __  30   why the mice sing.

21. A. almost                      B. even                        C. never                      D. usually

22. A. coincidence   B. evidence               C. guidance               D. instance

23. A. at once           B. by means              C. for example D. in fact

24. A. during                       B. inside                      C. through                 D. without

25. A. fashions                   B. instructions C. patterns                D. styles

26. A. access                      B. printer          C. screen          D. software

27. A. call                             B. hear                        C. sing                         D. write

28. A. accustomed  B. convinced             C. involved                 D. qualified

29. A. actually           B. obviously               C. simply           D. unlikely

30. A. figure out                B. get about              C. run across            D. talk over

Students are asked to  _____ themselves in this boarding school and they are only allowed to go back home once a week.

A. act  B. behave  C. perform    D. observe

  In the early morning all of us stood at the top of the mountain __ east of the city, watching _____burning sun rising.

A. /; a     B. the; a      C. the; the       D. /; the

To get into the habit of smoking means ____ one's own life short.

A. to make    B. makes   C. making     D. make

It's ___ so easy as you imagine.

A. almost not   B. not nearly    C. hardly  D. not almost

Modern science and technology has ___ communication between people far apart.

A. made convenient  B. made it convenient 

C. made it convenient for D. made it convenient to