—Jane, I saw your brother yesterday.
—It ________ be him. My brother is studying in Shenzhen.
can’t
mustn’t
needn’t
一______ is your father? — A bank clerk. He works in a bank near my home.
______ went hiking last weekend because of the bad weather.
—Must I wait for you here? —No, you ______.
Mary, put on your coat, ______ you'll catch a cold.
We know that she enjoys ______ books very much.