He showed the visitors ________the library .

My English is poor(差的). Can you help me _______it?

 —White doesn’t look good _______ you,but you look cool _____ black.

 —The green bag reminded the old man _____ the days when he was young.

—At last，we had problems______hearing．

--- Both the young and the old are getting crazy _______ WeChat(微信).
--- I agree. Nowadays we can see many people spend their free time ______ it.

House prices increased __________ an average of 23% in 1998.
A. to           B. by            C. at

Wang Wei is good    running. He thinks it is good    his health.
A. for;at B. at;for C. at;to

Some soccer fans arrived Shanghai last month .
A. at  B. in  C. /

My school is different ______ theirs. Mine has many after-school clubs.