单项选择题

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

A．principal
B．number of
C．that
D．too many
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(Many) of the society's wealth (is controlled) by large (corporations) and government (agencies).
A．Many
B．is controlled
C．corporations
D．agencies
单项选择题
A student is (allowed) to (enter into) this room (only if) a teacher (has given) permission.
A．allowed
B．enter into
C．only if
D．has given
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