---Why not go out for a walk on such a sunny day?
---______ great.
| A．sound | B．sounding | C．sounds | D．sounded |
A thief slipped into the room without ______.
| A．seeing | B．noticing | C．to be seen | D．being noticed |
. 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 |