A. where is his mother B. where his mother is C. where was his mother D. where his mother was
单项选择题The secretary tried to （） the smoke by opening a window of the meeting room.
A. deface B. detect C. discriminate D. dissipate
单项选择题All children are avid （） praise.
A. on B. for C. with D. at
单项选择题—When （）you（）to learn to skate —Five years ago.
A. do; start B. will; start C. had; started D. did; start
单项选择题—Thanks for your help. —（）
A. No, thanks B. Let me see C. It doesn't matter D. That's OK
单项选择题—（） will you come back7 —In an hour.
A. How soon B. How often C. How far D. How long
单项选择题—Yesterday I won the first place in the 100-meter race. —Really （）!
A. Congratulations B. Never mind C. That is all right D. I'm sorry to hear that
单项选择题—A latest magazine, please. —Only one left. Would you like to have（）
A. it B. one C. this D. that
单项选择题More than one third of the Chinese in the United States live in California,（）in San Francisco.
A. predominantly B. previously C. practically D. permanently
单项选择题We should help her when she is（）
A. in trouble B. in a trouble C. in the trouble D. in troubles
单项选择题Please show me（）to send an e-mail, John. It's the first time for me to do it.
A. how B. what C. when D. where
