His father encourages him________up math．
| A．doesn’t give |
| B．not to give |
| C．not give |
| D．not to giving |
－Last semester, he had a hard time______ English.
| A．learns | B．learning | C．to learn | D．learnt |
－Our dining hall is always ________________ teachers and students at noon.
| A．crowd with | B．crowd by | C．crowded with | D．crowded by |
－Linda was just going out shopping________the telephone rang.
| A．while | B．when | C．after | D．because |
－Our teacher told us that the moon _______ around the earth.
| A．traveling | B．travel | C．travels | D．traveled |
－He buys __________ books, but he doesn’t read them at all.
| A．hundred of | B．hundreds of | C．two hundreds | D．two hundreds of |