单项选择题

Many countries are increasing their use of natural gas, wind and other forms of ______ .

A．energy
B．source
C．power
D．material
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单项选择题
The child was sorry ______ his mother when he arrived at the station.
A．to miss
B．having missed
C．missing
D．to have missed
单项选择题
Luckily, most sheep ______ the flood last month.
A．endured
B．survived
C．lived
D．passed
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