.Modern agriculture has greatly developed and nowadays animals are usually raised in _____ we call factory farms. As a result of this, lots of labour is saved.
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which
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where
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what
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how
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The field research will take Joan and Paul about five months; it will be a long time ____ we meet them again.
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after
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before
C
since
D
when
_A container weighs more after air is put in, ____proves that air has weight.
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A
as
B
it
C
that
D
which
Energy, passion and a burning desire are, you see, ________ true learning takes.
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A
that
B
what
C
how
D
which