10.听第四段对话,回答第18~20小题. 18.Who is coming to Mike's house tomorrow? A.His grandfather. B.His uncle. C.His grandmother 19.What does the mother have to do? A.Do the dishes. B.Sweep the floor. C.Do the dishes and sweep the flood 20.How many chores does Mike have to do? A.3. B.4. C.2.