My brother _____while I ______.
—Do you know ______ ? —Sorry. I don't have a watch.
Mother is the person ______ is always there for you.
—Hey, Molly. You ______ on the phone just now. —Oh, I was in the library.
—Do you think the rain will stop tomorrow ? —I hope so. It ______ for three days. It's too bad.
—Whose T—shirt is this? Is it John's? —It ______ be his. It's too small for him.