参考答案
1—6：CBCDAD 7—12：ABCCDD 
13—18：CABABB 19—24：DCCBDA
25—27：BBC 28—32：CBCAC 33—37：CBADC
38—42：home; development; ; takes; without; successful
43—47：fixed; warmth; succeed; achievement; pronunciation
48—52：calendar; Ancient; mentioned; simply; pioneer
53—58：was discovered; has devoted; was watching; to develop; to drive; brings
59—68: worried; ways; visit; Firstly; enough; diet; matter; able; share; sadness
69. As soon as you click the mouse, there is a great deal of information. 
70. You will not find anything unusual about him until you learn more.
71. Perhaps you should go over what you’ve learned as often as possible. 
72. I wonder how I can achieve a balance between my schoolwork and my hobbies. 
73. People dressed baby boys in blue in the hope of that boys would be protected. 
74. We think David is the most suitable person to be / as our monitor. 
书面表达：
    According to a survey, we know most middle school students sleep less than 7 hours' each night, much less than required.
    First of all, the students have too much homework. Second, schools and parents pay less attention to their sleep. Another important reason is that many students play with their cell phones or iPads before sleeping. This is one of the main reasons for bad sleep. Other reasons include stress and bad moods.
    So we must take some ways to stop this. First, less homework should be given to the students by teachers and parents. Second, students need to keep away from digital devices for at least an hour before sleep .Last, more attention should be paid to their health.
                                        （99words)

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