单项选择题

The (principal) mason for the great (number) of smoke is (that) there are (too many) factories in this are

A． principalB. numberC. thatD. too many
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单项选择题
(Be sure) to put out the light (before) you (leave). Yes, I'll (put out it).
A．Be sure
B．before
C．leave
D．put out it
单项选择题
(Although) I expected something (different), I was (still) surprised by (which) he said.
A．Although
B．different
C．still
D．which
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