—What’s on the floor?— A. That’s my key. B. There’s a book. C. It’s red. D Yes , it is .
—Can the plane fly _____ the Atlantic Ocean? —Yes,but it needs to go_____the clouds for hours.
—Can you tell me _____when the teacher came into the classroom? —Sorry,I don’t know.
The teacher said that _____ of the boys would take part in the fashion show.
—______ did your sister leave China? —She______ for three years .
“Don’t _____ to strangers on your way home.” Mother often_____ to me.