补全对话，根据提供的首字母填入所缺的字母。
（1）What a           you g           to do today?
I a           g           to pl           the violin.
（2）I           he going t           buy a book? Y          ,he is.
（3）Wh          are th          g        ?
They're g           t           the park.
（4）A           the girls g           t           do their homework?
N          , they a         .