--- ________ your sister a student?---No, she ________.
—Could I borrow your camera?—________,but please give it back by Saturday.
—Sir,could you please put out your cigarette?This is a smoke-free(无烟的)school.—________.
I will do some cleaning as soon as I________my homework.
I wanted to help my mother do the housework.She asked me to________the rubbish.
—Could you please help me sweep the floor?—________.