—Whose T—shirt is this? Is it John's?—It ______ be his. It's too small for him.
—It’s time _____ lunch. —OK. Let’s _____.
Mr. Wang _____ gets up early. So he is ______ late for work.
—_____ do you go to the zoo with your brother? —Three times a month.
My brother usually _____ his classroom after school. But now he _____ basketball.
—What _____ Yu Ping usually _____ in her free time?—She usually goes to the library.