完形填空
    This is an educational story．A teacher once told each of her students to bring an empty plastic bag and a large bag of 1 to school．If there was someone in their lives that they 2 to forgive，they chose a potato，  3  the name of that person and the date on it, and then put it  4 the plastic bag．Some of their bags were quite heavy．
    They were then told to5 these bags with them everywhere for one week，putting them beside their beds  6 and next to their desks in the classroom．
    As they carried the bags around with them，they 7 what a weight they were carrying，and how hard they needed to pay attention  8 ． Of course，the potatoes were rotten(腐烂的)soon，and smelled  9 ．
    This is the same as the price we pay for keeping our pain and unhappiness with us!So 10others is not only a gift for them，but also a very good gift for ourselves．

若直线x－y＝2被圆(x－a)²＋y²＝4所截得的弦长为2$\sqrt{2}$，则实数a的值为（    ）

某人是B型血，他可以给哪些血型的人输血呢？他可以接受哪些血型的人给他输血呢？

绘制本地图所采用的比例尺为1：4000000，在地图上量算出李家村和张家店两村的距离为2厘米，那么两村的实地距离为（  ）

More and more couples would rather   ___   a second baby  ____  their first child can feel less lonely.