Sometime is knocking at the door. Who ______ it be? --It ______ be Tom. He is still in the school.
I wanted to help my mother do the housework.She asked me to________the rubbish.
—Could you please help me sweep the floor? —________.
—Could I use the phone,Miss Li? —________.
Here are some books.Could you please________?
—Could I________your iPad,Alice? —Of course.Here you are.