单项选择题

Some aspects of a pilot’s job ______ be boring, and pilots often ______ work at inconvenient hours.

A.can; have to
B.may; can
C.have to; may
D.ought to; must
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单项选择题
In a new situation, an intelligent person （）.

A.knows more about what might happen to him
B.is sure of the result he will get
C.concentrates on the situation
D.cares more about himself
单项选择题
The woman over there is ______ mother.
A.Julia and Shelley’s
B.Julia’s and Shelley’s
C.Julia and Shelley
D.Julia’s and Shelley
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