The environment here becomes better and better. ______ birds are coming back.

A. Thousands of B. Thousand of

C. Thousands D. Thousand

Wolves have good team work. They usually work _____a team when they hunt.

A. for B. as C. of D. in

______there is no buying, there will be no killing.

A. If B. While C. Because D. Since

He spent a lot of time on English. ______, he got the most points in the English test.

A. In fact B. Otherwise C. As a result D. However

We need clear air and water, so we _____ protect the environment.

A. can B. may C. must D. might

—I called you at 5:00 yesterday afternoon, but no one answered.

—Sorry. I _______ football with my friends at that time.

A. play B. played C. will play D. was playing

I bought a big box ________ books for kids in poor areas.

A. collects B. to collect C. collect D. collected

Since you are ______music, why not go to the Music Club in our school?

A. crazy about B. surprised at

C. ready for D. afraid of

This washing machine ______yesterday. It needs repairing.

A. worked well B. broke down

C. come down D. went on

I saw him crossing the street. The sentence structure is _______.

A. S+V+DO B. S+V C. S+V+P D. S+V+DO+OC