1 . Ladies and gentlemen, please fasten your seat belts. The plane ________.

A．takes off

B．took off

C．is taking off

D．has taken off

2 . He’s got himself in a dangerous situation ______ he is likely to lose control over the plane.

A．when

B．that

C．which

D．where

3 . The number of people invited________ fifty, but a number of them________ absent for different reasons.

A．were; was

B．was; was

C．was; were

D．were; were

4 . ________ from space, the earth, with water________ 70% of its surface, looks like a blue ball.

A．Seen; covered

B．Seen; covering

C．Seeing; covering

D．Seeing; covered

5 . Gun control is a subject________ Americans have argued for a long time.

A．of which

B．with which

C．into which

D．about which

6 . Now that Lucy was out of a job, she ______ going back to school, but she hasn’t decided yet.

A．had considered	B．has been considering
C．considered	D．is going to consider

7 . You should try to get a good night’s sleep ______ much work you have to do.

A．however	B．no matter
C．although	D．whatever

8 . The factory used 65% of the raw materials， the rest of which             saved for other purposes.

A．is

B．are

C．was

D．were

9 . The wild flowers looked like a soft orange blanket__________ the desert.

A．covering

B．covered

C．cover

D．to cover

10 . Come and see me whenever ________.

A．you are convenient	B．you will be convenient
C．it is convenient to you	D．it will be convenient to you