It is required that students _____mobile phones at school, so seldom _____them using one.
| A．don’t use; will you see | B．should not use; you will see |
| C．not use; will you see | D．can’t use; will you see |
Some people fear that air pollution may bring about changes in weather around the world .
| A．/ ; the | B．the ; / | C．an ; the | D．the ; a |
so much salt in the Dead Sea that people won’t get sunk.
| A．It exists | B．T here has existed |
| C．There exists | D．It has existed |
. I’m really hungry. Let’s eat at restaurant has a free table.
A. whichever B. whatever
B. which D. what
These surveys indicate that many crimes go by the police， mainly because not all victims report them.
| A．to be unrecorded | B．to have been unrecorded |
| C．unrecorded | D．unrecording |
—Did you go to Hainan Island for your vacation last month？
—I to go， but I got sick at the last minute.
| A．plan | B．am planning | C．have planned | D．had planned |