Time goes by so fast . We must never miss the chance to show love for our parents and make them _____ how much they mean to us .
Peter, you should leave the light when you’re out.
I think it’s unusual thing to find a UFO.
The young lady________ is talking with our teacher comes from America.
Waste paper mustn’t _______. We should keep our environment clean.
Come on! You will catch up with others _______ you work hard.