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— When did you become a volunteer? — I ________in this group since 2008.

A. joined B. took part

C. have joined D. have been

You can’t wear shoes inside this place. It ________.

A. doesn’t allow B. isn’t allowed

C. hasn’t allowed D. wasn’t allowed

—It’s clever _____you to help me work out the difficult math problem. Thanks!

—You are welcome. Now it’s easier ________ you to understand it.

A. of； of B. of； for

C. for； of D. for； for

The gate of the factory should be wider. It is ________for two cars to go through.

A. too wide B. wide enough

C. not too wide D. not wide enough。

—What a thick fog! I went the wrong way at the corner and finally got lost.

— It's easy to make a wrong turn here even under an ideal weather________.

A. conversation B. conclusion

C. condition D. communication

We students can collect food and old clothes for the homeless people， and the teachers can ________learning skills for the poor children.

A. give B. offer C. prevent D. provide

If we use new types of energy， they will produce little pollution. ______ they cost very little and never run out.

A. However B. Moreover

C. Otherwise D. For example

— How can I get a present in the game show?

—You ________ one if you answer all the questions correctly.

A. were given B. have given

C. will be given D. have been given

—The trip to Jurong was really interesting. We picked a lot of strawberries.

—________， I agree with you， but there was too much traffic on the road and I felt sick.

A. By the way B. In this way

C. In some ways D. On my way

You know great changes ________ in our city in the past ten years.

A. have been taken place B. took place

C. have taken place D. were taken place