——Who plays the piano           , Sam or Jerry?—— Jerry. But he gave the performance chance to Sam this time.

增加：在缺词处加一个漏字符（^），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下面画一横线，并在该词的下面写出修改后的词。

注意：1.每处错误及其修改仅限一词。2.只允许修改10处，多者（从第11处起）不计分。

    Last Saturday I went to the library as usually. At about noon, I was enjoying my reading near a lake while suddenly I hear someone crying for help. I went up to see what was happened. I was shocking to find a little child struggling in the water in the distance while many peoples were standing by without doing anything. Without any hesitation, I had pushed through the crowd as I took off my coat, but jumped into the water quickly. I managed to reach him and carried him back to safety. To his great relief, the kid was saved.

    I am proud what I did. I hope everyone can give a hand when someone else is in need.

为了提高学生书写汉字的能力．增强保护汉字的意识，我区举办了“汉字听写大赛”，经选拔后有50名学生参加决赛，这50名学生同时听写50个汉字，若每正确听写出一个汉字得1分，根据测试成绩绘制出部分频数分布表和部分频数分布直方图如图表：

请结合图表完成下列各题：

（1）求表中a的值；

（2）请把频数分布直方图补充完整；

（3）若测试成绩不低于40分为优秀，则本次测试的优秀率是多少？

Many parents found their ____ (miss) children with the help of CCTV1.