单项选择题

(Prior to) our (conference), the (executive) director had requested that everyone (was) well prepared.

A．Prior to
B．conference
C．executive
D．was
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单项选择题
Canning (is) the (most wide) used (method) of food (preservation).
A．is
B．most wide
C．method
D．preservation
单项选择题
(On his way) to school yesterday morning, Prof. Wang (came across) an old friend and (stopped talking) with him (for quite a while).
A．On his way
B．came across
C．stopped talking
D．for quite a while
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