The fragments of Xiaogang's life in one day are as follows: ① Get up at 5: 45 in the morning and listen to the Chinese and English texts to be learned that day. ② Line up to do exercises.

(1) The correct behaviors are: ① ④ ⑤. The incorrect behaviors are: 236.

(2) "Omission" (Note: students can answer any one of them, and if they are justified, they can get extra points)