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
They suggested us _____ our luck at the casino.
A．to try
B．try
C．trying
D．tried
单项选择题
Outside my office window, there is a fire _____ on the right.
A．ladder
B．escape
C．steps
D．stairs
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