15.聽下面一段材料,回答第12-14小題. 12.How many times was Tom late this week? A.Two. B.Three. C.Four. 13.Why didn't Tom hear the alarm? A.He was sleeping. B.He forgot to set it. C.His mother turned it off. 14.Who is the woman? A.Tom's teacher. B.Tom's mother. C.Tom's sister.