Smoking is one of the ________causes of cancer，killing millions of people each year.

A.
major
B.
similar
C.
commercial
D.
chemical

They must try every means to _____ out flies and other insects in the restaurant to guarantee food safety.

A.
take
B.
put
C.
pick
D.
wipe

I’m tired out．I stayed up the whole night, ______ for my midterm math exam．

A.
studying
B.
to study
C.
to be studying
D.
studied

To compete more effectively with others，it is time that university students to study abroad after graduation．

A.
tried
B.
are trying
C.
try
D.
will try

What especially impressed us was the way_____the girl studied foreign languages.

A.
不填
B.
which
C.
by which
D.
how

Do you know the reason_____she didn’t attend her boyfriend’s birthday party yesterday??

A.
why
B.
which?
C.
for that
D.
for why?

The men got out and pushed the bus . But it ____ move , not one bit .

A.
couldn''t
B.
wouldn''t
C.
needn''t
D.
shouldn''t

I''m surprised that he ____ to help me when I needed his help .

A.
should refuse
B.
would have refused
C.
should have refused
D.
may have refused

Why ____ you keep troubling your mother with such question while he is busy .

A.
can
B.
will
C.
would
D.
must

The reason_____the manager explained at the meeting sounds reasonable.?

A.
which
B.
what?
C.
why
D.
for which ?

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