I’m surprised that you should have been fooled by such a(an)_____trick. 
#20751
A
ordinary
B
easy
C
smart
D
simple
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Many people think that it is ______ making such an experiment.
#18907
A
valuable
B
worthwhile
C
convenient
D
important
People go out with masks,________.
#20921
A
fear of swine flu.
B
afraid of swine flu.
C
fearing of the pig flu.
D
being afraid of swine flu..