单句改错(句子中有一个错的单词,请写出,并改正)

问题描述:

单句改错(句子中有一个错的单词,请写出,并改正)
whole of the students are very happy.
Thanks a lot of for helping us .
We have learned Eglish since five years.
I cost ten yuan for that book.
Don't worried about your son.

All of the students are very happy.
Thanks a lot for helping us .
We have learned Eglish for five years.
I spent ten yuan for that book.
Don't worry about your son.