The boy with glasses ________ the judge with his attitude and sense of humor．

caused

prefered

impressed

bother

The computer system ________ suddenly while he was searching for information on the Internet．

broke down

broke out

broke up

broke in

Can you believe there should be ________ many poor people in ________ a rich country?

so; such

such; so

so; so

such; such

How beautifully she sings! I have never heard ________．

the better voice

a good voice

the best voice

a better voice

John plays football ________, if not better than, David．

as well

so well

as well as

so well as

He came into the classroom through the back door ________ being seen by anyone．

in

for

to

without

The scientists are doing everything they can ________ the dying Northeast Tigers．

save

to save

saving

to have saved

Tom kept quiet about the accident ________ lose his job．

so not as to

so as not to

so as to not

not so as to

A driver should ________ the road when ________．

concentrate on; drive

concentrate in; driving

concentrate to; drove

concentrate on; driving

Zhou Yang went on ________ trip to Tibet．

a seven-days

a seven-day

seven day

seven-days