Ⅰ. 根据句意及首字母提示完成单词（5分）
1. I think there will be f________ plants and more people in the future.
2. E________ is ready. Let’s begin the meeting.
3. There are many t________ on the mountain. They make the mountain green.
4. Scientists think r________ will do housework instead of people in the future.
5. Many fish died because of the water p________ in the river.
