Peter was out of town that Sunday. Therefore, he _____ the crime.




A.couldn't have committed
B.needn't have committed
C.must have committed
D.might have not committed

There's a world of difference between being a teacher and a student.




A.a great similarity
B.a yawning gap
C.on the contrary
D.a great divide

No matter __________, Mozart was an accomplished composer while still a child.




A.how it remarkable seems
B.how it seems remarkable
C.how seems it remarkable
D.how remarkable it seems

Following the accident, he was officially accused of _________ driving.




A.reckless
B.careful
C.hurry
D.responsible

Why did it take so long to develop the x-ray microscope?




A.Funds for research were insufficient.
B.The source of illumination was not bright enough until recently
C.Materials used to manufacture x-ray tubes were difficult to obtain
D.X-ray microscopes were too complicated to operate.

Based on the information in the passage, what can be inferred about x-ray microscopes in the future?




A.They will eventually change the illumination range that they now use
B.They will provide information not available from other kinds of microscopes.
C.hey will eventually be much cheaper to produce than they are now.
D.They will probably replace electron microscopes altogether.

He didn't bat an eyelid when he realized he failed the exam again.




A.wasn't happy
B.didn't want to see
C.didn't show surprise
D.didn't care

Remember to appreciate what your friends do for you. You shouldn't take them _________




A.for granted
B.as a rule
C.out of habit
D.as usual

"Getting a good job doesn't matter much to me?'




A."I am only interested in getting a good job."
B."It's interesting for me to pet a good job"
C."I don't care about getting a good job."
D."I am not good at getting a good job."

No one but the experts was able to realize that the painting was an imitation, as it greatly resembled the original.




A.It was hard for ordinary people to judge between the fake painting and the real one, but not for the experts.
B.The painting looked so much like the authentic one that only the experts could tell it wasn't genuine.
C.It was obvious that only a person with great talent could fake a painting so successfully
D.It was almost impossible for amateurs to realize that the painting was not authentic, though the experts could judge it quite easily.