The secretary tried to （） the smoke by opening a window of the meeting room.

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