文中共有10处语文错误，每句中最多有两处。错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：在错的词下面一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

      2）只允许修改10处，多者（从第11处起）不计分。

    Last Sunday, I showed Tom, the friend from the USA, around the city. This was the first time that Tom visited my hometown, and he found the trip excited.

Early in the morning, I took her to the park near my home. He was astonished to seeing so many people did exercise in the park. Then, we went to the museum. From the exhibitions, he learned a lot at the history of the city. After leaving the museum, we went downtown and found it was crowded with quite a lot of building. On our way to home, Tom said he was really amazed by that he found. But he hoped that he would have chances to come here again.

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在用电火花计时器（或电磁打点计时器）研究匀变速直线运动的实验中，某同学打出了一条纸带，已知计时器打点的时间间隔为0.02s，他按打点先后顺序每5个点取1个计数点，得到了O、A、B、C、D等几个计数点，如图所示，则相邻两个计数点之间的时间间隔为____s．用刻度尺量得点A、B、C、D到O点的距离分别为x₁=1.50cm，x₂=3.40cm，x₃=5.70cm，x₄=8.40cm．由此可知，打C点时纸带的速度大小为____m/s．与纸带相连小车的加速度大小为____m/s²．