单项选择题

(Passengers) (are warned) not to (get off) a bus while (moving).

A. Passengers
B. are warned
C. get off
D. moving
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单项选择题
(Let's not) waste time on (matters of no important). We have other (vital) problems to (deal with).
A. Let's not
B. matters of no important
C. vital
D. deal with
单项选择题
It is difficult (to make) yourself (understand) in a foreign country (when) you (have no knowledge) of its language.
A. to make
B. understand
C. when
D. have no knowledge
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