答案：
1.I first saw the baby panda when she was only 10 days old.
2. At four months, she weighed about 10 kilograms and started to go outside her home for the first time.
3.At the very beginning, Xi Wang drank her mother’s milk for up to 14 hours a day.
4.Sadly, it is difficult for giant pandas to survive in the wild.
5.It is necessary for use to learn something about the world around us.
6.It is impossible for you to get success without working hard.
7. Mothers often leave baby pandas for two whole days on their own.
8. If people find baby pandas alone, they will often take them away.
9. If the giant pandas are in danger, what can we do?
encourage farmer to leave the giant panda reserves
10. I will see some beautiful birds if I walk through a rain forest.
11. If I don’t buy them someone else will buy them.
12. Mother giant pandas have only one or two babies at a time.
13. Their number is getting smaller and smaller because their living areas are becoming farmlands
14. If farmers keep taking the land, giant pandas will have nowhere to live.
15. It is one of the world’s most important wetlands.
，我们将会及时处理。
