The worsening of global warming, _____human activities are to blame, has led to frequently extreme weather.
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A
by which
B
for which
C
that
D
what
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Disappointingly, the new computer, ________ he loves a lot, breaks down frequently.
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A
which
B
what
C
that
D
one
The weather turned out to be very good, was more than we could expect.
#78635
A
what
B
which
C
that
D
it
Flying kites, ______ some researchers point out, can not only bring about joy to us, but also promote our physical and mental health.
#78625
A
which
B
what
C
as
D
where
Sara treats her youngest son much better,_____ makes other children envy badly .
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A
that
B
it
C
she
D
which
、The virtues of thrift（节俭）and hard work is vital for everyone, is often the case in any society.
#78643
A
as
B
that
C
when
D
where