______ Tom be in his office so late at night ?

—I won’t go to the concert this evening. I ______ watch the NBA on TV. It’s more exciting.

You'd better take a heavy coat. Sometimes it ______ be very cold.

    One of the few things you ______ say about English people with certainty is that they talk a lot about the weather. 

---Must he remember everything he has learned in the class?---No, he _____.