Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.
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A
since
B
before
C
after
D
when
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What the doctors really doubt is my lather will reeover from me serious disease soon.
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A
whether
B
when
C
why
D
how
Usually an adult man can grow about 1.7 meters tall, _____ a few may grow as short as 1.3 meters.
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A
while
B
or
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for
D
so
Most of the developing countries are faced with lots of troubles , _____the financial problem is not the worst .
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A
which
B
with which
C
that
D
of which