单项选择题
Joan is （） sister.
A.Mary and Jack B.Mary’s and Jack’s C.Mary’s and Jack D.Mary and Jack’s
单项选择题 This piece of （） is long enough for you to make a shirt.
单项选择题 — What's the problem, Harry? --- （）
单项选择题 The big man has always been eating on the go,（）he has got stomachache.
