I don’t know if I _______ free tomorrow. If I _______, I will go to the bookstore.
Someone is knocking at the door. It _______ my mother. It’s time for her to be back.
The floor is so wet. Let’s _______.
The flood in 1998 washed lots of houses _______ and lots of people _______.
—I’d like to take five days off, Mr. Smith.—______ . Don’t you know we’re very busy these days?