根据下列句子所给汉语注释或上下文，写出空缺处各单词的正确形式。
1. They flew to Scotland in a balloon _______ (成功).
2. It's every _______ (市民) duty to keep our neighborhoods clean and tidy．
3. Do the clothes need _______(熨烫)?
4. We can see many dead fish in the _______ (污染) river.
5. If the heavy rain _______( 继续) to fall, the small village will be in danger.
6. Would you like to see the maple (枫树) _______ (叶) in Hongmei Park ?
7. All of the students were excited about Yao Ming's _______ (到达).
8. —Just now a car was out of _______ and hit a tree by the road.
— Bad luck!
9. Tim and I are good friends, and we keep our secrets to _______.
10. —Could you tell me the _______ of the building?
—It's about 1000 metres tall. There are 30 floors in all.
