单句改错 (共10小题；每小题1分，满分10分)
下面每句中都有一处错误。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；
小题1:The police is investigating (调查) the cause of the accident.
小题2:It’s quite difficult to find who’s responsible of pollution.
小题3:That’s why I want to find out.
小题4:Here is the book written by him of lots of pictures in it.
小题5:That sounds like a great idea.
小题6:There are five for you to choose . You can choose one of them.
小题7:Please dial this number if you want any farther information.
小题8:The solution of the problem was helpful.
小题9:He apologised his teacher by writing him a letter.
小题10:He passed the English test, it really surprised his teachers.