—No, ______________.

—About ten thousand.

    The students were having their chemistry(化学)class. Miss Li was telling the children what water was like. After that, she asked her students, "What's water?" No one spoke for a few minutes. Miss Li asked again, "Why don't you answer my question？Didn't I tell you what water is like?"

    Just then a boy put up his hand and said, "Miss Li, you told us that water has no color and no smell. But where to find such kind of water？The water in the river behind my house is always black and it has a bad smell. "Most of the children agreed with him.

    "I'm sorry, children." said the teacher, "Our water is getting dirtier and dirtier. That's a problem."

    Last summer, my mother and I went to her hometown, Guilin. The city is very 1in the world,2 it has beautiful rivers and hills. Many 3 from different countries of the world go to 4 it every year. My mother was born5a small village near the Li River. When she6a little girl, she studied at the village school 7only five classes and seven 8. Some children liked to 9 in class, 10 my mother was very good. The teacher was strict but very friendly.