单项选择题

—What's the matter with you
—After the long walk, my leg ______ and I couldn't go any further.

A. gave out

B. gave off
C. gave in

D. gave up

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单项选择题

Many people keep dogs as pets because dogs are regarded as（）friends to people.

A. lonely
B. only
C. loyal
D. fair

单项选择题

Friendship helps us understand ______ we are, ______ we need each other and ______ we can do for each other.

A. what
when
that
B. who
why
what
C. where
why
that
D. who
when
how much

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