He is a highly ________ sales representative.
A. competitive
B. compete
C. competitor
D. competition
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We can't afford _____ such a price.
A. to pay
B. paid
C. pay
D. pays
-Would you like to ________ the performance of newly developed energy saving device?-Sorry, but I am not in the position to ________.
A. make a comment on; comment
B. have a comment with; comment on
C. build up comments on; comment on
D. come up with a comment; on
Would you please ______ your voice? The baby is sleeping in the next room.
A. raise
B. lower
C. lose
D. soften
__________ this material can be used in our factory has not been studied yet.
A. Which
B. What
C. That
D. Whether