题目内容

As Mr. Best was passing the bookshop, he thought he'd just ___ to see whether any interesting books were on sale.

A.look in
B.look up
C.look around
D.look for

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I can assure you that under no circumstances ___ his motherland.

A.he will betray
B.will he betray
C.he will not betray
D.will he not betray

It is bad manner to ___ other people behind their backs.

A.do up
B.do by
C.do away with
D.do down

___ otherwise directed by a doctor, this medicine should be taken three times a day.

A.Even if
B.Unless
C.Except that
D.As

Passengers may leave bulky articles under the stairs ___ the conductor's permission.

A.at
B.with
C.on
D.in

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