---How is your mother doing? Is she ________? --Oh, thank you. As a matter of fact, she _______.
Then you usually lie there just ______ the ceiling, thinking about everything that could go wrong.
---Do you mind my taking the books away?---________.
—Who______ it be that is knocking at the door?—It ______ be Father, but I’m not sure.
The reason for his success is ______ he worked very hard.
-How do you like our restaurant? -I can’t find a ________one.