12.听下面一段对话,回答第18至20小题. 18.Who will spend the weekend with the man? A.His parents.B.His friends.C.His teachers. 19.Where will the man go camping? A.By a lake B.On a hill C.Near a river. 20.What does the woman ask the man to be careful of? A.Weather.B.Traffic.C.Fire.