The talented boy _________ write lyrics when he was at the age of ten.
A. may B. could C. must
My sister spends too much time ______computer games.
| A．to play | B．play | C．plays | D．playing |
Teenagers _______ allowed to drive in the street .
| A．should not be | B．should be not |
| C．not should be | D．shouldn’t |
I don't know _______.Can you tell me________?
| A．how swim; what to do | B．how to swim ; what to do it |
| C．how to swim; what to do | D．what to swim; how to do |
That's very kind ______ you. I know it's very hard _______ you to do that.
| A．of, of | B．of, for | C．for, of | D．for, for |
David used to _____________ in the afternoon.
| A．practice swimming | B．practicing swimming |
| C．practice swim | D．practices swimming |