You’ll fail your next exam _______ you work hard at your lessons from now on .A. or B. so C. unless
—Bob, ________ is my brother Frank. —Nice to meet you, Frank.
—Is ________ a photo of your parents? —No, ________.
You can see my grandparents in the ________.
—Is Alice your sister? —________. My sister is Helen.
—Here ________ two pens for you, Alan. —Thanks.