Now the air in our town is __ than before. Yes. Something must be done to stop the pollution.
Waste paper mustn’t _______. We should keep our environment clean.
Come on! You will catch up with others _______ you work hard.
Jack runs ______of all in the sports meeting. He is good at running.
—Would you like to go to the cinema with me?—Yes, I’d love to. But I ______ the film twice.
—Your room is very untidy. Please________ your things, Mike.—OK, Mum. I will do it at once.