20.听第三段材料,回答第12至14小题. 12.How many times was Sam late for class this week? A.Once. B.Twice. C.Three times. 13.What did Sam do last night? A.Surfed the Internet. B.Learned English. C.Read English stories. 14.How often does Mary read English stories? A.Once a week. B.Twice a week. C.Almost every day.