— I'm not sure. I ______ go to Beijing on business that day.
—“I'm sorry.”
—I ________ go abroad for further education instead, but it depends.
—I'm not sure. I ________ have to take care of my grandma.
—No, it ________ be him. I saw him off at the airport half an hour ago.
—It ________belong to Adam. Look! His bag is on it.