________our earth, or it will be no longer fit for us to live on

A．Protect

B．To protect

C．Protecting

D．Protected

—Have you completed your paper?

—Not yet．I________the last chapter．

A．wrote

B．am writing

C．will write

D．have written

—Look! The clouds are gathering

—Yes, I’m afraid it________be pouring down soon．

A．need

B．must

C．should

D．might

—What do you think of my composition?

—It________well except for some spelling mistakes

A．read

B．reads

C．is read

D．is reading

Natural materials will break down________a period of time

A．for

B．through

C．over

D．on

Although he was disabled, he tried to lead________as possible．

A．as normal a life

B．so normal a life

C．as a normal life

D．so a normal life

—Who should be sent there, Alice or Mary?

—________．More people than needed have arrived there

A．Neither

B．None

C．Either

D．Both

The salesman said that________thief was a young man with________brown hair．

A．the, a

B．the, 不填

C．a, 不填

D．a , a

As I will be away for least a year，I’d appreciate ________ from you now and then ________ me how everyone is getting along．

A．hearing；tell

B．to hear；tell

C．hearing；telling

D．to hear；to tell

— Having a trip abroad is certainly good for the old couple．

— ________it remains to be seen whether they will feel strong enough．

A．So

B．And

C．For

D．But