2 . — ________ we take the subway to the airport now?
—I think so. The traffic ________ be very heavy at this time of the day.

A．Must, must

B．can, can’t

C．can’t, may

6 . 从方框内选择合适的词或词组，并用其适当形式填空

turn off; be responsible for;get ahead,sign up; pay off; in particular; rather than;in other words; be fed up with; remind

1. Only by working harder in your job can you ____________ and become famous.
2. You don’t meet our need. ________________, you will have to change a new job.
3. A big fire broke out in the factory last night, somebody should __________________ for it.
4. Mike prefers to play football _____________   play basketball after school.
5. Your hard work_________________ last year.
6. If you want to join in the singing competition, you have to _______________ right now.
7. When you leave the office, don’t forget ________________ the lights.
8. Though he is so fat, Mr Brown______________ taking any physical sports.
9. Passengers___________ to take all their personal belongings when they leave the plane.
10. Sandstorm takes place frequently in this area, my hometown ________________.

8 . To make our city more beautiful, rubbish ________ into the river .

A．needn’t be thrown	B．mustn’t be thrown
C．can’t throw	D．may not throw