情景问答：
1.打扰别人时出于礼貌，你应先说______________
A. Excuse me
B.Sorry
2.你迷路时，你应对警察说____________
A.I’m lost
B.I don’t know
3.你想问Sam现在Daming在做什么，你应说____________
A.What is Sam doing?
B.What is Daming doing?
4.你想知道物品的价格时，你应问___________
A.How much is it?
B.How old are you：?
5.路人向你表示感谢时，你应说___________
A. Thank you
B.You’re welcome