单项选择题

I can understand their eagerness that you ______ the main speaker.

A. be
B. shall be
C. are to be
D. must be
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Only ten to twenty percent of cold viruses are transmitted by carriers, who, sneezing and coughing, ______ the viruses into the air.
A. spray
B. sprinkle
C. spread
D. sprout
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In recent years much more emphasis has been put ______ developing the students' productive skills.
A. onto
B. in
C. over
D. on
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