1) It's already 10 o'clock I wonder how it _______ that she was two hours late on such a short trip.

　　A. came over

　　B. came out

　　C: came about

　　D. came up

　　2) The better __________ you have of words, the better chance you have of saying exactly what you mean.

　　A. demand

　　B. comment

　　C. command

　　D. performance

　　3) The teacher usually writes his _________ on the margin of the composition.

　　A. comments

　　B. words

　　C. review

　　D. command

　　4) It is surprising that such an innocent-looking man should have ________ such a crime.

　　A. confirmed

　　B. clarified

　　C. committed

　　D. conveyed

　　5) Letterboxes are much more _______ in the UK than in the US, where most people have a mailbox instead.

　　A. common

　　B. normal

　　C. ordinary

　　D. usual

　　6) _______ other nurses, Alice is careful and patient.

　　A. Looking like

　　B. Comparing with

　　C. In common with

　　D. As to

　　7) When you want to introduce yourself to an American, you can just try a _______ greeting, such as “Hello, my name is…”

　　A. commonly used

　　B. used commonly

　　C. commonly using

　　D. using commonly

　　8) It is said that dogs will keep you ______ for as long as you want when you are feeling lonely.

　　A. safety

　　B. company

　　C. comfortable

　　D. friend

　　9) __________ with other children, the father thinks, Jack is a most satisfying son.

　　A. Commenting

　　B. Complaining

　　C. Compared

　　D. Committed

　　10) Every four years athletes from all over the world _______for medals in the Olympic Games.

　　A. fight

　　B. struggle

　　C. complete

　　D. compete

　　11) Meg realized she'd been a ________ fool; she was always doing foolish things.

　　A. complete

　　B. commercial

　　C. content

　　D. constant

　　12) The rapid development of science and technology make the ______ among people more and more convenient.

　　A. competition

　　B. communication

　　C. companion

　　D. comprehension

　　13) Math is a _______ subject for both arts and science students.

　　A. compulsory

　　B. must

　　C. concrete

　　D. obliged

　　14)Due to the loud noises from the neighborhood, he could not ______ his mind on his books.

　　A.collect

　　B. gather

　　C. concentrate

　　D. fix

　　15) From his appearance we may safely ________ that he is a heavy smoker.

　　A. show

　　B. promise

　　C. confirm

　　D. conclude