Here is a practical tip I from my mother.
Earth Day is celebration of life and our planet. It is a reminder that we need to ________the world we live in and that we should learn to respect life and nature.
After many attempts,she ________managed to get promotion.
There is no ________to what you can do if you try.
—Henry,________the light is ________when you leave the lab.—All right.
—________that middle school ________Beijing Normal University?—As far as I know,it is.