A. HasB. HaveC. HavingD. Has had（）to use crutches for s……

单项选择题The policeman asked the boy （）

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