A.because
B.for
C.since
D.as
A.while
B.meanwhile
C.in the meantime
D.at the same time
A.now and again
B.now and then
C.over and over
D.far and wide
A.how to weigh the cost and the benefit
B.all the practical economic theories
C.something useful about business
D.logical way of thinking
A.A particular religious belief.
B.A firm"s decisions.
C.Weather conditions.
D.The study of literature.
A.speak up for
B.speak ill of
C.speak well of
D.speak well for
A.None of us
B.Not all of us
C.All of us
D.All of us not
A.None of us
B.Not all of us
C.All of us
D.All of us not
A.domesticating animals
B.hunting
C.prey killing
D.sports activities
A.statement
B.reference
C.mention
D.comment
A.believe
B.to believe
C.believing
D.believed
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