.—Is Jack your brother?
— . He is my friend.
| A．Yes, he is. | B．No, he isn’t. |
| C．Yes, she is. | D．No, she isn’t. |
- I'm sorry I made a mistake!
-______. Nobody is perfect.
| A．You'd better not | B．You're right |
| C．I don't care | D．Take it easy |
If you ______ smoke, please go outside.
| A．can | B．should | C．must | D．may |
Jim was watching a late night film______ the television went blank.
| A．while | B．since | C．until | D．when |
- Your e-mail address again? I ______ quite catch it.
- It's Lily@126.com.
| A．don't | B．didn't | C．won't | D．wouldn't |
Health experts believe that even a little exercise is better than______ at all.
| A．none | B．little | C．no one | D．few |