—The air is full of smoke and people are coughing.
—It will get worse________the government does something about the pollution.
| A．but |
| B．unless |
| C．except |
| D．if |
—The speaker is a tall man with glasses.
—Then itbe Mr. Smith, who is short and thin.
| A．can’t | B．wouldn’t | C．won’t | D．mustn’t |
About 187 passengers were reported _____the shipwreck which happened last month.
| A．to have been survived | B．having survived |
| C．to have survived | D．to survive |
Once new difficulties ________in your work, it’s always important to use your brains.
| A．arise | B．raise | C．arouse | D．rise |
--How are your recent trip to Sichuan?
—I’veneverhad ______ onebefore.
| A．apleasant | B．amorepleasant |
| C．amostpleasant | D．themostpleasant |
Shy people often avoid situationswould force them into close contact with other people．
| A．which | B．where | C．when | D．what |