单项选择题

The ______ crown jewels are kept in the Tower of London.

A．valued
B．valueless
C．invaluable
D．usable
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单项选择题
Once you become a soldier, you will be given a monthly ______ by the army.
A．income
B．allowance
C．wage
D．salary
单项选择题
We may often be puzzled by ways of expression that the native speaker of English does not even have to ______ , as English is not our first language.
A．think out
B．think for
C．think over
D．think about
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