单项选择题

We see lightening (before we hear) the thunder it (causes) because sound travels (more slowly) than (light is).

A．before we hear
B．causes
C．more slowly
D．light is
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单项选择题
He is opposed (to) the project (for the reason) why it is not (feasible) (for the time being).
A．to
B．for the reason
C．feasible
D．for the time being
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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