单项选择题

The waste, (according) to the people there, has (already) found (their) way into (the) drinking water.

A．according
B．already
C．their
D．the
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单项选择题
Only when (it started) to rain (he noticed) that he (had left) his raincoat (somewhere).
A．it started
B．he noticed
C．had left
D．somewhere
单项选择题
You (will not able) to pass the examination (unless) you work (harder) than you (do) now.
A．will not able
B．unless
C．harder
D．do
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