raininghard for 3 hours without stopping

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.

There were so many books in the shopping center, I didn’t know_______ .

Are these gloves _____________ —-No, they’re not ____________.

Jack is not in the office at the moment—Oh, he ______ those who are going to take the driving test in an hour.