Many ________ trees must be planted every year．

A．thousands of

B．million of

C．hundred of

D．hundreds

I will tell him about this ________ he comes back．

A．as soon as

B．until

C．as

D．while

It’s important ________ you to send a recording to the radio station．

A．to

B．with

C．for

D．of

If you want to get information about hotel and transport when you are traveling, you may ________ on Internet．

A．look it up

B．look it out

C．look it down

D．pick it up

Read the ________ carefully before you use the new recorder．

A．information

B．instructions

C．messages

D．articles

If you want to close the file, remember ________ it on the computer first．

A．to save

B．pressing

C．starting

D．protecting

Chen Mei went into the study, ________ the light and began to work on Internet．

A．turn back

B．turned off

C．turn to

D．turned on

Professor Nelson wanted to know ________．

A．When would the conference begin

B．When the conference would begin

C．When will the conference begin

D．When the conference will begin

Thousands of spectators came to Shanghai to ________ the 48 th World table Tennis Championships．

A．see

B．notice

C．watch

D．look

The heavy snowstorm made the mountain climbers ________ halfway．

A．stop

B．to stop

C．stopping

D．stopped