离开教室的时候记着关灯.
Remember to the lights when you leave the classroom.
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).
Don't swim in the river.It's (危险的) for you.
The (人口) of China is about 1.41 billion in 2021.