单项选择题

Spending the summer traveling round Australia is a great idea, but it begs the ______ of how we can afford it.

A．mercy
B．pleasure
C．question
D．permission
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You should think ______ yourself instead of just obeying others.
A．of
B．to
C．by
D．for
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According to news report, personal ______ of guns in the USA causes a lot of trouble.
A．wealth
B．possession
C．need
D．matter
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