单项选择题

(As you know that) you must (check in) at least 30 minutes (before takeoff) for (most flights).

A．As you know that
B．check in
C．before takeoff
D．most flights
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单项选择题
Learners cannot assimilate information that (is presented to) (him) at (a higher level) of abstraction (that) at which they feel comfortable.
A．is presented to
B．him
C．a higher level
D．that
单项选择题
When she (arrived), I was (pretty) fed up, because I (waited) (since) eight o'clock.
A．arrived
B．pretty
C．waited
D．since
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