根据汉语提示填入恰当的单词。

1. He walked to the post office with a quick light ______  (步伐)．

2. Guangzhou is one of the biggest cities in  ______  (南方的) China.

3. Our beach house is just a few miles from the  ______  (海洋)．

4. When he was a kid, he had to get up at 5:00 am and chop some ______ (柴) for the fire.

5. The program is organized by the local ______ (政府) of Guangdong.

6.   ______ (挽救) endangered animals is one thing we can do for our world.

7. It's not difficult to ______ (回收) paper.

8. Mr Smith makes model toys out of old TVs in his ______  (业余的) time.

9. Protecting the    ______ (环境) is our duty today.

10. When was the Great Wall ______(修建)?