A.It is useless to complain.B.It is useless complaining……

单项选择题He seemed to be unaware（）the trouble he was causing.

A.for
B.on
C.of
D.about

单项选择题I can't see（）between these two books

A.a many difference
B.much difference
C.many difference
D.much a difference

单项选择题Letters, maps and pictures are（）

A.essays
B.files
C.documents
D.records

单项选择题No one knows who will call（）to solve the problem.

A.tune
B.tunes
C.the tune
D.a tune

单项选择题He was late（）the traffic jam.

A.as result
B.as a result of
C.as the result of
D.a result of

单项选择题There have been（）medicine in the last 50 years.

A.great advancesin
B.a great advancein
C.great advanceon
D.a great advanceon

单项选择题Would you mind（）us how old you are?

A.tell
B.to tell
C.telling
D.to telling

单项选择题50% of the people（）for the survey were female.

A.were questioned
B.who questioned
C.who were questioned
D.question

单项选择题There are many cities（）very fast.

A.expand
B.which expand
C.which expanding
D.to expand

单项选择题Just over 70% of people（）for the survey said the net had become essential.

A.questioning
B.questioned
C.question
D.to question

单项选择题There are often advertisements（）to other websites on the Internet.

A.lead
B.led
C.leading
D.to lead

单项选择题Are you interested in（）sport?

A.over-road
B.on-road
C.away-road
D.off-road

单项选择题What's the（）difference between the two parties?

A.essential
B.necessary
C.dominant
D.great

单项选择题He tried to hack（）the banking system.

A.to
B.on
C.into
D.for

单项选择题For more information, visit our（）at www.cambridge.org.

A.net
B.website
C.internet
D.network