A:hey,have you heard anything aboutbird flu?
B:Bird flu?What is that?
A:It is a flu that caused by the birds I heard.
B:Oh.So what about it?
A:I have heard from News said that it is a very severe flu which is ever had in the human history.
B:Wow,sounds scary.
A:Yeah,I know.I also can't believe it,but it looks like it is true.
B:Well,I think we better watch out for this flu then.
A:Yeap!We really should.