单项选择题

in the meantime, the question facing the business is whether such research is ______ the costs.

A. worth
B. worth of
C. worthy
D. worthwhile
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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
单项选择题
He mast have had an accident, or he ______ now.
A. would have been here
B. had to be here
C. should be here
D. would be here
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