89.　　 Within that term he read not one English novel but five.

88.　　 Good health depends on good food, exercise and enough sleep.

87.　　 He broke his neighbour’s windows again, which made his parents very angry.

86.　　 You should concentrate on your lessons in class, otherwise you can’t understand what the teacher has said.

85.　　 I have come to realize that one can’t learn a foreign language well unless he works hard.

84.　　 Everyone should know how to obey the traffic rules, and thus many traffic accidents can be avoided.

83.　　 You can’t learn English well without practicing speaking English.

82.　　 The development of modern science and technology has brought about great changes to our society.

81.　　 Our monitor is regarded as the best student in our class.

80.　　 Everyone knows that smoking damages people’s health.