The dog ____ mad(疯的).
—Is this your sister’s key, John? —No, it isn’t. ______ is in the bag.
—I haven't seen Tom for a long time. Is he ill? —_____. His teacher told me he was in hospital.
Excuse me, could you tell me ________?
At the foot of the hill, you could hear nothing but the _____of the running water.
—Who is the girl standing over there? —Well, if you _____ know, her name is Kate.