单项选择题

(There )was (too) much dust that we (couldn’t) see (what) was happening.

A．There
B．too
C．couldn’t
D．what
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单项选择题
He finds (it) easier to do the (cooking) himself than (teaching) his wife (to cook.)
A．it
B．cooking
C．teaching
D．to cook
单项选择题
Factory workers (had to) work (very hard) before, (so) (had farmers).
A．had to
B．very had
C．so
D．had farmers
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