单项选择题

We'll visit Australia next year __ we have enough money.

A．provided
B．unless
C．until
D．lest
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单项选择题
Although I spoke to him many times, he never took any __ of what I said.
A．notice
B．warning
C．observation
D．attention
单项选择题
Our company decided to __ the contract because a number of the conditions in it had not been met.
A．destroy
B．forbidden
C．assume
D．cancel
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