单项选择题

Although they plant trees in this area every year, the tops of some hills are still ______.

A．blank
B．hollow
C．vacant
D．bare
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单项选择题
The chairman of the board ______ on me the unpleasant job of dismissing good workers the firm can no longer afford to employ.
A．compelled
B．posed
C．pressed
D．tempted
单项选择题
If the seller fails to provide good title, the contract will become null and ______.
A．vacant
B．void
C．broke
D．bubble
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