— Someone is knocking at the door. It _________ be Tom.
— No, it ________ be him; he has gone to Sydney.
| A．must; can’t | B．might; mustn’t | C．may, neddn’t | D．can; mustn’t |
It is usually warm in my hometown in March, but it ______ be rather cold sometimes.
| A．must | B．can | C．should | D．would |
The atmosphere of the earth ______ us from the strong sun light.
| A．prevents | B．keeps | C．stops | D．protects |
Finally they arrived at a place, ______ sold cigarettes and other small articles.
| A．which | B．where | C．in which | D．what |
All his friends and relatives came to ______ him on his daughter’s being admitted to Qin Hua University.
| A．celebrate | B．congratulate | C．memorize | D．respect |
—I meant ______ you to the host at the party, but I forgot.
—That’s all right. Some other time, maybe.
| A．to introducing | B．to introduce | C．introducing | D．having introduced |