单项选择题

These pieces of wood have _______ and become useless because of too much rainfall.

A．disappeared
B．decayed
C．altered
D．transformed
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单项选择题
Although reservations in advance are usually required in motels in busy areas, this is not always _______ in less crowded parts of the country.
A．the case
B．the reality
C．the truth
D．the fact
单项选择题
If we go on consuming energy so wastefully, ________ are our oil wells will be dried up before new energy resources can be found to replace oil.
A．chances
B．opportunities
C．questions
D．problems
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