Mary clapped her hand over her mouth _______ she realized what she had said.
| A．while | B．as soon as |
| C．suddenly | D．then |
If I had been a little more careful, I _______the wallet behind.
| A．won't leave | B．hadn't left | C．didn't leave | D．wouldn't have left |
Sally is always looking in the mirror, _______herself.
| A．enjoying | B．respecting | C．admiring | D．behaving |
_______we are worried about is that air pollution is becoming much heavier in Han Dan.
| A．It | B．What | C．Why | D．Which |
Thanks to modern technology which has now broken the law of seasons, farming is no longer _______ weather and temperature.
| A．at the mercy of | B．in the charge of | C．in the name of | D．in view of |
While there are clear signs of a _______ recovery in the global economy, the country still faces a very difficult situation.
| A．formal | B．raw | C．modest | D．thorough |