请你把下面句子中的错误选出来，并改正。
( ) 1. A cow eat grass. _________________
A B C
( ) 2. I do my homework yesterday. _________________
A B C
( ) 3. Are you girl? _________________
A B C
( ) 4. This is mine coat. _________________
A B C
( ) 5. My shoes is blue. _________________
A B C
