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：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：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。
I have two pets, Polly and Sally. They are green-and-blue parrot. Their home is a shady tree in the garden where they are freely to fly from branch to branch. There has a wooden box for them in a tree. This is their nest, where they sleep at night there and take shelter whenever it rain. Every morning, after clean their nest, I feed them with some seeds and give them a bowl water to drink. They are pretty and lively birds. This is really interesting watching their movements, because I never feel dull spending my time with them.
