Kate and Bruce worked in the same company (公司) in New York. They were good ____ often joked with each other.

    One day Kate ____ Bruce on her way to the company. She said, "Hi, Bruce. It's good to see you.

    "How can you see ____when I'm not here?" asked Bruce.

    "What do you mean? You are not here?" asked Kate. "____you are here."

    "No, I' m not," said Bruce. "And I'll bet (打赌) you ten dollars that I can prove (证明) I'm not here.

    “All right?”said Kate. "Ten dollars. Now prove you are not here.

    “It's ____.”said Bruce. “Am I in Hong Kong?”

    "No," said Kate.

    "Am I in Paris?"

    "No," said Kate.

    "If I'm not in Hong Kong and I'm not in Paris," said Bruce, "then I ____be somewhere else(其他的). Is that ____?"

    "Of course," said Kate.

    "And if I' m somewhere else, I can't be here， can I? Ten dollars, please."

    "You're so ____ Bruce."

    "We had a bet."

    "Sure we had a bet," said Kate. "But ____ can I give you ten dollars if you are not here?"

    Then Kate walked away ____ a laugh.

如图，直线a∥b，∠1=45°，∠2=30°，则∠P=____°．

一辆汽车在高速公路上行驶，由于遇到紧急情况而刹车，以速度$v\left(t\right)=7-3t+\frac{25}{1+t}$ （t的单位：s，v的单位：m/s）行驶至停止。在此期间汽车继续行驶的距离（单位：m）是（   ）

容量为20的样本，数据的分组及各组的频数如下：（10，20，2；（20，30，3；（30，40，4；（40，50，5；（50，60，4；（60，70，2．则样本在区间（10，50上的频率为（　　）