先通读下面的短文，掌握其大意，然后从A、B、C、D四个选项中选择可以填入空白处的最佳答案。

    Rules are everywhere．When you read in the library,play basketball1drive a car,you have to2some rules．Rules are3to us．You must also follow the rules on the4 ．

    Linda and her friend Carl go to the US5plane．She takes the emergency exit seat(靠近紧急出口的座位)．She6card says：

    If you are in an emergency exit seat,

You7

◎Be at least(至少)15 years old and healthy．

◎Be able to(能够)speak and read English very8．

You must not

◎Sit with a child(two years old and under)．

◎Sit with a pet，like a9 ， a bird，etc．

    This is because you need to be free to give10to others．