It is difficult for any of us to eat better, exercise more, and sleep enough, ________we knowwe should.

I became a student ten years________. I have been a student _________1996. I have studied here ________ about 10 years.

You’d better read the ______ first before you use the new camera.

It was impolite of him ____without ____good－bye

I can’t ______ it in English because I can’t _____ English. Can I ______ you the story in Chinese