﹣Jim，are these your keys？（ ）
﹣____．They're hers．
| A． |
Yes，it is |
B． |
No，it isn't |
| C． |
Yes，they are |
D． |
No，they aren't |
—Please mind your head, sir.
—________
| A． |
It doesn’t matter. |
B． |
OK! Thank you. |
C． |
Don’t mention. |
D． |
I’m afraid not. |
Making robots is one of ________ activities among students. Each of them has his own robot.
| A． |
more popular |
B． |
the most popular |
C． |
more difficult |
D． |
the most difficult |
Many people have lost their homes because of wars. It’s important for people ________ a peaceful world.
| A． |
have |
B． |
had |
C． |
to have |
D． |
to be having |
________ the weather improves, we’ll have to cancel the outdoor picnic.
| A． |
Unless |
B． |
If |
C． |
Because |
D． |
When |
—Could you tell me ________ pay the bills?
—You can pay your bills through Alipay（支付宝）online.
| A． |
how much I’ll |
B． |
how many I’ll |
C． |
how can I |
D． |
how I can |