Listen! Sally is singing in that room.– It ______ be sally. She has gone to Paris.

I know it’s important to live an environmental life. So I _______ my story books to the kids.

The boy was so ______ in reading that he didn’t hearhis father knocking at the door.

I must apologize for _____ ahead of time.— That’s all right. [ ]

and gentlemen, please fasten yourseat belts The plane__________