I don't think __________ possible to master a foreign language without much memory work.
| A．this | B．that |
| C．he | D．it |
. The happy look on his face suggested that he ________the final examination successfully.
| A．passes | B．had passed | C．would pass | D．should pass |
I would have come sooner but I ________ that they were waiting.
| A．haven’t known | B．hadn’t known | C．don’t know | D．didn’t know |
___________ we should do to protect wildlife?
| A．Do you think what | B．Do you think how |
| C．What do you think | D．How do you think |
— Do I have to clean the dining room now?
— No, you ______.
| A．don’t have to | B．mustn’t | C．needn’t to | D．shouldn’t |
About 110 million people moved to this city. The population is ______ as ten years ago.
| A．as twice large | B．twice as large | C．as many twice | D．twice as many |