单项选择题

Good travelers don't leave ______ on trains or airplanes.

A. rubbish
B. litter
C. garbage
D. pollutant
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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
单项选择题
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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