根据下列句子及所给汉语注释，写出空缺处各单词的正确形式。
1. Children sat happily on ______ (坐垫) on the hard floor.
2. The ______ between the two cities is 600 miles. (距离)
3. They are on a ______ across the Atlantic Ocean. (航海航行)
4. Many dead fish are seen ______ (漂浮) on the river.
5. They travelled by ______ (气球) over the ocean.
6. Jack took a deep ______ (呼吸) and then dived into the water.
7. He'd like to live in the ______ (城市商业区的) area.
8. He threw the paper onto the fire and it flew up the ______ (烟囱).
9. Because there is no food, the people are ______.
10. The ______ (商人) of Arab are doing their things all of the world