—What ______the number of the students in your school?
—About four thousand and seven hundred. A number of them ______ from the countryside.
| A．is; are | B．is; is |
| C．are; is | D．are; are |
— Why don’t you buy a new car now?
—________ I don’t have enough money.
| A．Because | B．If | C．Because of | D．As |
I think you won’t pass the coming English exam ______ you work hard from now on.
| A．whenever | B．although | C．if | D．unless |
---Can you think of any_______tips to protect yourselves against crime?
---I have no idea.
| A．safe | B．safety | C．safeless | D．safeties |
Nobody has the right to laugh at others _________ he is right.
| A．until | B．because | C．though | D．If |