—I didn’t see you when I went to your office yesterday afternoon. Where were you?—I ____ a meeting in the meeting room.
—What’s this in English?—It’s __________ ruler.
—Thank you for your help. —_____________.
—Is this ______ pencil? —No, it’s not ______.
—.Where are the baseballs? —They are _______.
Mary’s room is big ______ tidy, ______ Bob’s room isn’t tidy.