—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
-- The classroom looks like a mess!-- Yes, but who left the waste paper ______ around?
-- I think we'll give Bob a ring.-- We ______ . We have been out of touch with him for ages.
Honey, stay outside and ______ a few minutes; then we'll go to church together.
-- Why didn't you go camping with us?-- But I ______ all about it!
-- When do you need to pay the balance?-- ______ December 31.