Ladies and gentlemen, please fasten your seat belts. The plane________.
| A．takes off | B．is taking off | C．has taken off | D．took off |
—Americans spend more on health care than most other people .
— You’re right . But a new study shows that life in the United States is falling .
| A．development | B．position | C．experience | D．expectancy |
--- Will you waste your time and money on that?
--- Certainly ________.
| A．I not | B．don’t | C．not | D．no |
_________ to 100℃, water will boil.
| A．Being heated | B．Heated | C．Heating | D．To heat |
The traffic is heavy these days. I ________ arrive a bit late, so could you save me a place?
| A．can’t | B．must | C．need | D．may |
The consequences of our actions are unbelievably complicated and diverse _______ predicting the future is a very difficult business indeed.
| A．because | B．even if | C．in order that | D．so that |