短文改错（共10小题；每小题1分，满分10分）
下面短文中共有10处错误，每句中最多有两处，请你对其进行修改。错误涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏词符号（∧），并在此符号下面写出该加的词。
删除：把多余的词用斜线（ ）划掉。
修改：在错的词下划一横线，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。
Air travel has three advantage over train travel. First, it can save much time. We can fly from one place to other in a short time, but by train we have to spend more time. Second, air travel is more comfortable because the plane flies so smooth that we can have good rest during the trip. Third, the train is crowding sometimes and we have to sit for a long time, what makes us tired. But train travel also has it’s own advantages. For an example, traveling by train cost only a little money. Beside, we can enjoy the view out of the train’s windows.