He tried his best to solve the problem, _______difficult it was.
| A．however | B．no matter | C．whatever | D．although |
. — Please don’t make a noise.
— _____. I’ll be as quiet as a mouse.
| A．Yes, I won’t | B．No, I won’t | C．No, I will | D．Yes, I will |
I didn’t see her in the meeting room this morning. She _____ at the meeting.
| A．mustn’t have spoken | B．shouldn’t have spoken |
| C．needn’t have spoken | D．couldn’t have spoken |
It’s a fine day. Let’s go fishing, _____.
| A．won’t we | B．will we | C．don’t we | D．shall we |
— May I stop here? — No, you _____.
| A．mustn’t | B．might not | C．needn’t | D．won’t |
We _____ for her because she never came.
| A．mustn’t have waited | B．shouldn’t have waited | C．mustn’t wait | D．needn’t wait |