5 . Hainan is a beautiful place with little _______. The air there is clean and clear.

A．population

B．pollution

C．pronunciation

7 . 框中所给单词或短语的适当形式填空。

population, square, as far as I know, feel free, any other, desert, deep

1. If you have any questions, please ________ to ask me.
2. The glass bridge in Shijiazhuang is longer than ________ one in China.
3. The Taklimakan (塔克拉玛干) is the largest and driest ________ in China.
4. The dancing room is about 200 ________ meters in size.
5. Susan is the smartest girl in our class. She may not talk much, but still waters run ________ (静水流深).
6. ________, Tom climbs the hill every day to breathe fresh air.
7. The ________ of China is much bigger than that of any country in Africa.

9 . 用方框中所给单词的适当形式填空。

Asia, desert, square, population, ancient

1. One day even ________ may become farms thanks to the new technology.
2. This supermarket is about 500 ________ meters in size.
3. In ________ times, people thought that the earth was the center of the universe.
4. My mother tells me that three fourths of the ________ are Chinese in this country.
5. The young man traveled widely in ________, such as China and Japan.