Mr. White had to travel somewhere on business, and as he was in a hurry, he decided to go 1 He liked sitting2 a window when he was flying, so when he got onto the plane, he looked for a window seat. He3 all of them taken but one. There was a young man 4 beside it, and White was surprised that he had not taken the one 5 the window. Anyhow, he went towards it.When he 6 it, however, he saw that there was a notice on it, written 7 large letters,8“This seat is kept for proper balance. Thank you.” Mr. White had never seen such a notice before, but he thought the plane must 9 something especially heavy in its room10 makes it necessary to have the passengers properly11, So he walked on and found 12 empty seat, not beside the window  13 .

    Two or three other people 14  to sit near the window 15 the young man, but they also read the notice and went on. Then when the plane was nearly 16 , a very beautiful girl 17  into the plane. The young man, who was watching the passengers coming in, 18 took the notice 19the seat beside him, and20 succeeded in having a pretty companion during the whole trip.

计算：﹣0.5²+$\frac{1}{4}$﹣|﹣2²﹣4|﹣${\left(-1\frac{1}{2}\right)}^3$×$\frac{4}{9}$．

连词成句。

打工妹石芳丽在骑电动车时不慎将退休老教授韩健撞倒。她立即送老人就医，并辞去工作专心陪护老人。老人不仅放弃了追责和索赔，还让家人帮助石芳丽找到了一份新工作。这一案例启示我们要 （）

①勇担过错 ②敬业奉献 ③宽容待人 ④珍爱生命