6．Having　此处是用动名词短语“Having a pile of newspapers and other mail on your doorsteps”作主语。

　　7．or　此处表示选择关系，因此填并列连词or。

　　8．that/which　此处为定语从句，修饰先行词a timer，因关系词替代先行词在从句中作主语，所以可填that或which。

　　9．off　根据语境及空前的“on and”可知，此处用off，表示关灯。

　　10．keep　定语从句的先行词为sensitive lights，且定语从句中谓语动词的数应和先行词一致，应用keep。

　　Ⅳ.参考范文：

　　Health and Sports

　　Good health is very important to everyone. A healthy person can always be energetic and enjoy his life. A person who is in poor health cannot work well.

　　When it comes to keeping healthy, playing sports enjoys widespread popularity among people. As high school students, we must study hard and take many important exams, which may make many students feel nervous. So it's necessary to take exercise regularly to help release stress. Physical exercise can help make muscles strong. What's more, while playing, we get relaxed, which can help us study more efficiently.

　　Since sports can make us physically and mentally healthy, we should do sports every day no matter how busy we are. Do remember that good health is the best wealth.

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