Our planet is called ____. We can ____ on Earth because there is ____ around us. Air has ____ and other gases. All plants and animals ____ oxygen. They need ____ too and there is water on Earth. ____ air and clean water keep us ____, so it's ____ to look ____ our planet.

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?