The rocks in the river are worn smooth ____ of water.

A.with the agency B. by the agent 　　C. through the agency 　　　 D. with the agent

This radio company is so big that it has a lot of ____ in foreign countries.

A.conductors                     B. agents                     C. drivers                    D. introducers

I ____ suppose what he said ____ true.

A./; isn't                             B. don't; is                  C. am not; is                D. don't; are

I ____ what he told me yesterday.

A.believe in                 B. believe                    C. believed in                      D. believed

What he said is ____, I think, as he is not honest.

A.believe B. unbeliever C. believable 　D. unbelievable

When Zhao Benshan played his comedy We Have Enough Money, we all ____.

A.fall about laughing 　 B. fell into laughter 　　　　　　

C. fell about laughing D. fell about laughter

The fat old man looked ____ in his tight pink trousers.

A.normal                     B. mockery                 C. moderate                       D. ridiculous

Have you ever ____ when everybody, else was very happy?

A.giggling                   B. to giggle                  C. giggled                   D. giggle

At the funny scene, my family ____.

A.burst into laughing B. burst out laughter 　

C. burst into laugh D. burst into laughter

Suddenly she ____ like a child when I came in.

A.burst into laughing B. burst out laugh　　　　　

C. burst out laughing D. burst out in laughing