68.Bebecca was unhappy for _____ the first chance to go abroad.
A.not having been givenB.not having given C.not givingD.having been given
69.By _____, water can be changed into gas. (参考: If ___, water can be changed into gas.)
A.heating B.being heatedC.having heated D.heated
70.On land many objects prevent sound _______ very far.
A.to travelB.travel C.from travellingD.to travelling
key: Key: 1-5 BDDAC 6-10 BACDA11- 15 CCBBB16-20 BDCBA
21--30 ABADC CDDCC31--40 AABDB CABCD41--45 BCDBB
46--50ABACB51--60 BCACBDAABA 61--70 CDABA CDABC
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