D) With regard to
12. A) him
B) his
C) them
D) theirs
13. A) on
B) to
C) in
D) with
14. A) to heat with
B) to heat it by
C) by heating it with
D) by heating with
15. A) was used
B) had used
C) had been used
D) was being used
KEY: BABDC BACCD ABBCC
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