He ______ the math problem, his classmates wanted to help him out.

　　 A. sticking over　 B. stuck　 C. stuck with　 D. sticking

After three months of hard work, the couple ________ found their lost son in a neighboring province.

　 A. frequently　　　 B. unfortunately　　 C. temporarily　　 D. eventually

— Was the driving pleasant when you went to Mexico last summer?
   — No, it ＿＿ for four days when we arrived, so the roads were very muddy.
A. was raining          B. had been raining         C. would be raining        D. rained

There are trees and flowers along both sides of the road______ our school.
A leading  to   B defeated  C won   D gained

Children need friends ______ their own age to play with.
 A. of        B. for     C. in      D. at

He was reading his book, completely _______ to the world.

A. lost　　　　　　　　　　 B. losing

C. to lose　　　　　　　　　 D. to have lost

–How do you keep in touch with your old classmates or schoolmates?

-- By chatting with them on the Internet, _______for three hours every day.

A. approximately　 B. averagedly　　 C. mostly　 D. absolutely

I just choose a simpler lifestyle, ____ where I can ride my bike all over and do not have to make a great living to survive.

A． that　　　　　 B． it　　　　 C． one　　　　 D． another

If I find someone who looks like the suspect, my 　　 reaction will be to tell the police.

A.physical　　　 B.immediate　　　 C.sensitive　　　 D.sudden

_____ China’s reform and opening up in late 1978, its quick development has aroused worldwide attention, which has made America anxious about it.

A. When　 B. As　　 C. While　　 D. Since