改错。 (     )1. Did you enjoy you yesterday, my children ? ________ A           B      C                           D (     )2. He taught his son how mend bikes . ________ A      B          C              D (     )3. It's very hot outside or it's cool here in the room . ________ A              B        C                 D (     )4. Let me to help you look for your ruler . ________ A   B              C               D (     )5. Our teacher said the earth went round the sun. ________ A       B                   C      D