单项选择题

It is essential that the temperature (is not) elevated (to a point) where the substance formed (may become) unstable and decompose into (its) constituent(组成的) elements.

A．is not
B．to a point
C．may become
D．its
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(Despite of) the pills (which) are available, many people (still) have trouble (sleeping).
A．Despite of
B．which
C．still
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(If) it receives (enough) rain at the proper time, hay (will grow) quickly (as) grass.
A．If
B．enough
C．will grow
D．as
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