改错题。 (     )1. On October, 2006, they toured Poland and enjoyed themselves . A                                      B        C              D (     )2. While was still a small boy , I became well-known A              B                     C       D (     )3.Mozart was so clever that he was a talent musician. A      B        C       D (     )4.— When did you begin to learn ride a bike? — Four years ago . A   B                              C                    D (     )5. They joined the Brazil in 2005. A       B         C        D ________ ________ ________ ________ ________