________ hard he tried, he could not change his wife’s mind.
A. However B. Whatever C. As D. No matter what
------I don’t know why he has made such a silly mistake in the exam.
------ He ____________ it before he handed in the paper.
A. may have checked B. might check
C. must have checked D. should have checked
Read the passage a second time, ___________ the meaning won’t become clearer to you.
A. and B. so C. or D. but
When she finished her story, none of us said anything about it, which made her feel rather ________.
A. embarrassing B. embarrassed C. embarrass D. embarrassment
E-mail, as well as phone calls, _____________ an important part in daily communication.
A. are playing B. is playing C. have played D. has played
If we don’t take steps, some rare animals, such as the Tibetan antelopes and pandas will ____________ some day just as dinosaur.
A. die out B. die away C. die down D. die off
