It’s traditional in China to firecrackers on Spring Festival. —-But the serious smog(雾霾)nowadays needs us to stop it.
Are you ________ the dark? –Oh, yes. I always go to sleep with the light on.
Has your brother ever been to the Sand Lake?––Yes, he has _______ the Sand Lake many times.
Look, what have you done?—Sorry. I think if I ____ another chance, I’ll do it better.
Please call Mary _______ 3456825. [ ]