78.　 It’s nothing serious, just a s____________ fever.　 　

77.　 We have to make knowledge work for us, and not become its s______________.

76.　 He found himself in a difficult s_______________. 　

75.　 How s____________ of you to do that kind of thing!

74.　 The students became s______________ the moment the teacher entered. 　

73.　 His sudden death was a s______________ to his family.

72.　 The sun is s_______________ brightly. 　

71.　 What a s________________ you can’t come to the party! 　

70.　 I’ll put the box in the s___________ to keep it cool.　 　

69.　 I want to get married and s_____________ down.