Many experts hold the view ____teacher development is _____the key to better education lies.
#32063
A
which, where
B
which, in which
C
that, where
D
that, in which
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The UN officials say it could be many weeks and even months ____ a deal is reached．
#33995
A
before
B
after
C
when
D
as
I made a promise to myself _______ this year, my first year in high school, would be different.
#30144
A
whether
B
that
C
what
D
when
It is uncertain side effect the medicine will bring about, although about two thousand patients have taken it.
#33258
A
that
B
what
C
how
D
whether
_____ these experiments were successfully completed would we think of going into humans.
#31522
A
If only
B
So that
C
Only if
D
Even if