The police are trying to () what really happened.

单项选择题(), you need to give all you have and try your best.

A．Being a winner
B．To be a winner
C．Be a winner
D．Having been a winner

单项选择题Gun control is a subject () Americans have argued for a long time.

A．of which
B．with which
C．about which
D．into which

单项选择题So sudden () that the enemy had no time to escape.

A．did the attack
B．the attack did
C．was the attack
D．the attack was

单项选择题Critics believe that the control of television by mass advertising has () the quality of the programs.

A．affected
B．effected
C．lessened
D．declined

单项选择题A workaholic works too much and usually forgets to have meals and go to bed. (), he doesn't have good health.

A．As a matter of fact
B．As a whole
C．As a result
D．As a rule

单项选择题In the Mediterranean seaweed is so abundant and so easily harvested that it is never () of great.

A．fare
B．payment
C．worth
D．expense

单项选择题—How many cakes can I have, Mom —None, dear. They () for your father.

A．prepare
B．prepared
C．have prepared
D．were prepared

单项选择题You shouldn't () your hope. Everything will be better.

A．give up
B．fix up
C．cheer up
D．put up

单项选择题—I'm going back to see my parents this afternoon. --().

A．It's very nice of you
B．You'd better hurry
C．Say goodbye to them
D．Give my best wishes to them

单项选择题One of the few things you say about English people with certainty is that they () talk a lot about the weather.

A．need
B．must
C．should
D．can