1 . The policeman said it was his careless driving that ________ the accident.

A．looked down upon

B．referred to

C．focused on

D．led to

2 . ________about their table manners, the guests decided to do everything that president did.

A．Worried

B．Worrying

C．Be worried

D．To worry

3 . ________ you begin to do something, you must carry on with it, otherwise you will never achieve anything.

A．Once

B．Unless

C．Before

D．Although

4 . The young man tried to stop, ________he drove too fast to stop.

A．and

B．but

C．so

D．or

5 . When I was in trouble, I always _______ my friend for help.

A．turn on

B．turn to

C．turn down

D．turn in

6 . He applied _________ a job as a teacher.

A．in

B．for

C．on

D．at

7 . What ____bad memory I have! You see, I forget to take _____key.

A．a; /

B．不填;the

C．a; the

D．the; a