When I walked past his house, I heard him _______.
| A．to sing | B．sang | C．sings | D．singing |
We’d better __________ some food now.
| A．buy | B．bought |
| C．to buy | D．buying |
Mr. White is fixing his computer because there is __________ wrong with it.
| A．nothing | B．anything |
| C．something | D．everything |
—Must I sweep the floor now, Miss Jackson?
—No, you __________. You can do your homework first.
| A．can’t | B．mustn’t |
| C．needn’t | D．shouldn’t |
Beihai Park is one of __________ parks in Beijing.
| A．beautiful | B．more beautiful |
| C．most beautiful | D．the most beautiful |
—__________ people are there in the meeting room?
—About 200.
| A．How many | B．How long |
| C．How much | D．How often |