— Look! The cat ________ from the tree. — Yes. It ________ the tree just now.
—Look! The man at the gate _______be our headmaster. He is always standing there every morning. —No, it_______ be him. He is holding a meeting in the office now.
—Your watch looks so nice. It must be expensive. —No. I ____ 20 yuan on it.
—How long have you________? —Since two years ago.
—Do you know whose car is it? —It belongs to_____. It isn’t ______.
The Chinese mainland has become the world's second______ market for iPhone.