51.   Its failure to do so until this week was a source of worry in the current and previous US administrations.

v. + in >>共 995
live 3.94%
say 2.38%
remain 2.16%
be 1.95%
kill 1.91%
work 1.82%
base 1.78%
use 1.69%
die 1.53%
stay 1.52%
worry 0%
worry + p. >>共 32
in 18.68%
than 17.58%
to 8.42%
as 7.33%
by 6.96%
with 6.23%
from 5.13%
on 5.13%
of 3.66%
after 2.56%
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