It was nearly an hour ____the sleeping pill ______effect.
#94865
A
when; took
B
before; took
C
since; had
D
before ; had
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I'll come to see you if _____.
#94710
A
you're convenient
B
it is convenient for you
C
you feel convenient
D
it is convenient with you
Only after staying in England for a few weeks did Li Lei become used ____ Chinese. 
#92323
A
to not speaking
B
not to speaking
C
to not speak
D
not to speak
  Until the present century, ________ demand for natural gas.
#94717
A
little
B
and little
C
there was little
D
was there little