He will go to the mountains with his parents if it next Sunday.
—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.