1．[2017·长沙]—Philips, ________ you make so much noise when your little sister is sleeping?
—Sorry, Mom. I'll stop right away.
A．can B．may C．must
2．[2017·永州]—Must we finish the homework now?
—________. Our teacher doesn't ask us to.
A．Yes, we must
B．No, we mustn't
C．No, we needn't
