70．magazines　71.recovering　72.balloons　73.forbidden

66．regular　67.valley　68.attitude　69.disappointed

75．The teacher told us that salt water ______(结冰) at a lower temperature than fresh water.

[答案]

74．After graduation, he began to show interest in ______(政治)．

73．Books of this kind are ______(禁止) to be taken out of library.

72．On sunny days you can see some colorful ______(气球) flying in the sky.

71．After the operation, the patient is ______(恢复) rapidly.

70．She has written articles for several women’s ______(杂志)．

69．His not passing the exam made his parents ______(失望)．

68．If you want to pass the exam, you must change your ______(态度) towards study.