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 Of all the things we eat and drink, water is the most important. Not all people realize this, but it is quite true. The human body can live without food for a long time, but two or three days without water usually result in death.

Many people do not understand how much water the human body needs, but many people do not drink enough, especially in the hot weather. Most people drink when they are thirsty but often need more water after exercises.

65 to 70 percent of the human body is water. Water is important in several different ways. Most people need five to seven liters（升） of water every day, but we needn’t drink this amount(量) because a lot comes from the food we have. If we don’t have enough water, however, we will feel tired and many become ill. Do you know what the best drink is? Yes, you are right. Cool water!

1.When do we need more water?________

2.How much water are there in the human body?_________

3.Must most people drink five liters（升）of water every day?_______

4.Which of the following is not right?_________

A student went to college(大学) after_41_ all his school examinations. There he put his name down for world geography. _42_after taking the first lecture on the first day, he did not go to class any_43_. The teacher noticed that this student was _44_ absent (缺课) and thought that he had changed to_45__class. He was very_46_when he saw the boy's name on the list(名单) of students __47_ wanted to take the geography examination _48_ the end of the year.

The teacher had prepared a difficult examination paper, which covered__49__he had taught, and he was eager(急切) to see_50__this student answered the questions. He expected that his answer would be very_51__. But when he examined his paper carefully, he found only one small mistake in it.__52__ this surprised him very much, he went through the paper__53__, but was still not able to find__54___one mistake, so he sent__55___the student to ask him about his work..

When the student had__56___the room, the teacher said to him, “I know that you came to my class only once on the first day and that you have been absent from all the others. Yet I have found only one small mistake in your paper.__57___ is that?”

“Oh, I'm sorry about that mistake, sir, ”answered the student. “After the examination, I realized __58___I ought to have written. I would not have made that mistake___59___I had not been confused(弄糊涂) by your ___60___lecture.”

The teacher asked us __________ so much noise.

— He said, “ Light travels much faster than sound.”

— He said that light _______ much faster than sound.

—What did he say?

—I don’t know what________.