---Why does the boss look worried? ---Tom left the company a month ago and his work ________ unfinished ever since.
–I drove to Zhuhai for the air show last week. -Is that you had a few days off?
—Thank you for your wonderful meal. —______.
—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
—Your mother becomes more and more forgetful. —Yes. She searched for her cell phone for a whole day last Sunday but it ______ in her coat pocket the next day.
_______ of food is in need nowadays in Africa.