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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