It is uncertain____side effect the medicine will bring about，although about two thousand patients have taken it.
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A
that
B
what
C
how
D
whether
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Mr Li began to teach in this school, _______, some time later, she became popular with the teachers and students for her excellent teaching levels.
#73603
A
where
B
when
C
that
D
which
The scientist, __________ my father works, is about 50.
#66953
A
on whom
B
to which
C
with which
D
with whom
A new school has．been set up ______ there was nothing a year ago but ruins．
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A
when
B
until
C
before
D
where
A warm thought came to me ________ I might help wash my mom’s feet on Thanksgiving Day.
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A
if
B
when
C
which
D
that