________ is known to all is that effective measures should be taken to deal with the problem of the overexploitation of our resources.
#67275
A
What
B
It
C
As
D
Which
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One theory, ________ suggested by Harvard University, is that humans began cooking their food, thereby releasing nutrients locked in the raw food and reducing the time needed to chew it.
#67116
A
which
B
as
C
that
D
what
After three hours’ climbing , they reached _____they thought was the place they’d been dreaming of .
#73010
A
what
B
which
C
where
D
that
The old town has narrow streets and small houses _____are built close to each other.
#68989
A
they
B
where
C
what
D
that
—Time is limited. I have to finish this tonight.—But it’s midnight now and you should have a sleep ______ much work you have to do.
#67579
A
however
B
no matter
C
although
D
whatever