例如: English has a large vocabulary, hasnt it? Yes. _____ more words and expressions and you will find it easierto read and municate。 A. Know B. Knowing C. To know D. Known
例如: There are eight tips in Dr. Rogers lecture on sleep, and one ofthem is:_____to bed early unless you think it is necessary。 A. doesnt go B. not to go C. not going D. dont go