He asked several questions_______ the professor who gave us a lecture_______the balance of nature.
| A．with; for | B．from; of | C．to; about | D．of; on |
Playing computer games ______ much of his time.
| A．picks up | B．takes up | C．gets up | D．comes up |
Our teachers often suggest we ______ take it easy when facing any difficulty.
| A．had | B．could | C．would | D．should |
Tom won the game, ______ was really beyond his wildest dream.
| A．that | B．which | C．it | D．what |
Just wait here, ______ you can hang around for a while. Your turn is half an hour away.
| A． or | B．so | C．but | D．and |
______ Mr. Li is now waiting for you on ______ first floor.
| A．A; a | B．The; a | C．The; / | D．A; the |