My uncle is a writer. He ______ many books since he was young.
—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 _______.