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A. on
B. in
C. with
D. at
12. The harder a student studies, _______.
A. the more his body gives off heat
B. his body gives off more heat
C. the more heat does his body gives off
D. the more heat his body gives off
13. When she heard the bad news, she _______completely.
A. broke away
B. broke down
C. broke out
D. broke through
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