找出句子中错误的一项并在横线上改正。

( ) 1. Did you had breakfast in the morning?                                                       

              A          B                C

( ) 2. There are the train.                                                                                  

                A    B   C  

( ) 3. It's about five hundred year old.                                                                

              A                     B        C  

( ) 4. I'm puting a film in my camera.                                                                 

                     A              B  C 

( ) 5. These child are flying kites.                                                                       

               A       B           C  

齿轮传动机构必须装置半封闭的防护装置。