我们都应该为保持我们学校干净尽一份力.(play a part in…)
We am not (独自)on the Great Way and the whole world is one family.
You'd better not leave your exact (地址) online unless it's an official website.
There is a new (规则)to make sure that you don't waste food.
China's Tianwen 1 (着陆)on Mars successfully on May 15,2021.
It's possible for people to live to be more than one (世纪).