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　　12345CDBAD

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　　1、Yes， we do.

　　2、About two miles. /She ran about two miles every morning.

　　3、She changed her exerase time. /She exercised later in the day.

　　4、At night.

　　5、 Everyone has their own biological clock and learning something about chronobiology can help us live healthier lives.

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　　12345CGAFD

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　　1、 recewe

　　2、express

　　3、purpose

　　4、burial

　　5、period

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　　One possible version：

　　Dear Frank，

　　I am terribly sorry to tell you . that I have lost the book you lent me last week. I think the book is very interesting，and I like it very much. I read it every day and plan to finish it next month. But last night when I came to my room， it couldn't be found anywhere. But don t worry. I will get a new book for you.

　　Old books are like old frieiuls. Once they are lost， they can never be replaced. I feel sorry for Josing the book am so careless with my things. This is a warning'to me. I should be more careful in the future.

　　Yours truly，

　　Zhou liao