— Wow! You look different! You wear glasses.— Yes, I did. But now I am wearing contact lenses(隐形眼镜).
If there are trees, the air in our city will be cleaner.
Will there be more people in 100 years, do you think? , I hope.
He was riding to school it began to rain.
useful invention(发明) the computer is!
There one country in the world.