The 16th Asian Games （）in Guangzhou in November, 2010.

单项选择题（）to use crutches for six months severely limited Mr. Locke's ability to work in the shipping facility.

A. Has
B. Have
C. Having
D. Has had

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