88.　 A lot of people died of s________________ as the result of the natural disaster. 　

87.　 The living s______________ of the Chinese people have been greatly improved.　 　

86.　 Flies ,mosquitoes(蚊子)and mice s________________ diseases. 　

85.　 He was in low s_____________ those days. He didn’t feel like doing anything.

84.　 This is a s_______________ day in the history of our country. 　

83.　 Can you s_______________ some time to help me?　 　

82.　 Florida is a s______________ state of the U.S.　 　

81.　 Water in a s____________ state is ice. 　

80.　 His son serves as a s______________ in Tibet.　 He joined the army in 2003.

79.　 Our path in life will not always be s______________.