Please be quiet!The students______ an exam．（　　）

﹣Hurry，Mum!The bus is coming．

﹣Wait a minute，dear．You cross the street until the traffic lights are green．（　　）

﹣Mom，may I drink the milk on the table？

﹣No，you can't．It smells______．It has gone bad．（　　）

﹣Hi，Tom．I haven't seen your parents for days．Where are they？

﹣They aren't at home．They_______ America for holiday．（　　）

Mom，I'm old enough to wash________ clothes and______．You can have a rest now．（　　）