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
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
—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
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。
—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
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
