在横线上写出单词的正确形式。 1. There are some things
题型：填空题
问题：
在横线上写出单词的正确形式。
1. There are some things that you can't change, like your (身高).
2. The seats have no back ____________ (紧靠着)which to lean.
3. A space sleeping bag is used to be fixed to the walls to prevent__________(漂浮).
4. We must do something to deal with the ___________ (污染) water, otherwise, the fish will die.
