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
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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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The quality of this kind of computer is ______ to that of imported computers.
A. worse
B. inferior
C. indifferent
D. much better
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