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)?