According to the rules of the library, a book can _____ for three weeks, and a DVD for one week.
Experts suggest that teenagers _____ at least 30 minutes exercising, five times a week.
As ______ matter of fact, Mr. Wang is in _____charge of this special school at present.
She never tells a lie, ______ ? A doesn’t she B. didn’t she C. does she D. did she
The food smells delicious! I can’t wait ______ it.
—What do you think of the film Avatar? —This is the best film_______ I have ever seen.