题目内容：

 

M: How come David is always so full of (1.) e______?

W: He has a strange but highly (2.) e______ way of sleeping.

M: What is that?

W: He takes a short sleep for an hour every six hours and has a (3.) t______ of four hours of sleep every day.

M: Where did he get that strange (4.) i_______?

W: He read from a book which (5.) s_______ it was the best (6.) w______ for human beings, and he believed it.

M: How many hours do you sleep a day?

W: I need at least 7 hours. I once tried to follow David’s (7.) e_______, but it never (8.) w______ out for me.

M: If I sleep (9.) d_______ the day, I can never wake up.

W: Not everyone is David, I (10.) g______.