短文改错。

下列短文每一行均有一处错误。请按下列要求改正。

1）此行多一词；用斜线（/）将其划掉，并在该行右边横线上写出这个词，也将其用（/）划掉；

2）此行缺一词；在缺词处加一个漏字符号（∧），在该行右边横线上写上该词；

3）此行错一词；在错词下划一横线，并在该行右边横线上写上改正的词。

Mr. Smith with his little Tom,

were going to the zoo by bus. The bus was crowded.                        1. _________

Little Tom sat on his father knees (膝盖). When the                          2. _________

bus stopped, an old lady got on to the bus, and the                            3. _________

boy jumps down at once and said, "Would you have                          4. _________

my seat, Granny?" "Thank you. You're good boy!"                            5. _________

Everyone laughed.