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【单选题】
__carefully if any change occurs when doing experiments in the lab..
A.
Observe
B.
To observe
C.
Observed
D.
Observing
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】________ in every aspect of his company's business, Paul made himself busy day and night. [ ]
A.
Being involved
B.
Involved
C.
Involving
D.
To involve
【单选题】Nowadays teens prefer going to the net-bar ______ they can chat with their friends by QQ or play computer games ______ some more reading.
A.
which; rather than do
B.
where; to do
C.
what; doing
D.
where; to doing
【单选题】His sudden look of fear made _____ clear that he had something to do with the matter．
A.
him
B.
this
C.
it
D.
that
【单选题】The first textbooks _______ for teaching English as a foreign language came out in the 16th century．
A.
having written
B.
to be written
C.
being written
D.
written
【单选题】_____ tomorrow, our ship will set sail for Macao.[ ]
A.
However the weather is like
B.
However is the weather like
C.
Whatever is the weather like
D.
Whatever the weather is like
【单选题】Being examined twice a year, whether it is a car or a bus or a truck, it is the rule that every driver____ obey in this city.
A.
shall
B.
can
C.
has to
D.
need
【单选题】More than a dozen students in that school ____ abroad to study medicine last year.
A.
sent
B.
were sent
C.
had sent
D.
had been sent
【单选题】The Beatles, _____ many of you are old enough to remember, came from Liverpool. [ ]
A.
what
B.
that
C.
how
D.
as
【单选题】Tom, ________ yourself. Did you forget the school rules?[ ]
A.
behave
B.
enjoy
C.
perform
D.
conduct