21.   Viagra increases blood flow in the penis, while Uprima, in contrast, increases levels of a brain chemical thought important for causing erections.

v. + important >>共 19
consider 53.24%
make 13.53%
deem 11.47%
think 6.18%
find 3.53%
have 2.65%
call 2.35%
see 1.47%
believe 0.88%
prove 0.88%
think + a. >>共 388
possible 8.47%
unlikely 6.55%
necessary 4.10%
likely 3.84%
best 3.58%
big 3.32%
appropriate 2.79%
impossible 1.92%
important 1.83%
better 1.83%
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