--Listen! Tom is singing in the next room.--It _______ be Tom. He has gone to Shanghai.
—What season is your favourite?—I like __________ best because the weather is very cool.
—What’s this in English?—It’s __________ ruler.
—Thank you for your help. —_____________.
—Is this ______ pencil? —No, it’s not ______.
—.Where are the baseballs? —They are _______.