If the green light doesn’t come on, you ______ go across the street.

—Isn’t that Ann’s husband over there?—No, it ______ be him-I’m sure he doesn’t wear glasses.

---I want someone to write the composition for me. --- No. As a student,  you ____depend on yourself.

—Must I finish the exercise this afternoon?—Yes, you ______, but you ______ finish it now.

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