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C.dead
D.dying
20.Mr.Green's good health is chiefly ________ proper diet and regular exercise.
A.due to
B.because
C.in connection with
D.in accordance with
21.The owner of the store promised to give the money back to the traveller ________ his return.
A.at
B.from
C.by
D.on
22.How could he convince them ________ his innocence?
A.on
B.of
C.with
D.over
23.It's ________ the government to make a decision on this issue.
A.thanks to
B.according to
C.due to
D.up to
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