Find out the mistakes and correct them. 找出错误并改正。

( ) 1. I walk to home every day.                                                      

                 A   B    C          

( ) 2. You need twenty minutes of exercises a week.                          

                     A                   B               C   

( ) 3. Runing is exercise.                                                                  

                 A    B      C       

( ) 4. There is a airplane in the sky.                                                   

                        A      B     C       

( ) 5. When did Danny ate breakfast ?                                               

                      A              B       C