"Back" practice! ~ ~ help ~

1. Unforgettable back, stumbling back, farewell back, reappearing back. "Hui" reflects the father's care for his son and is the deepest impression left by my father and son when they say goodbye. 2.① It shows that the father is in a bad situation, echoing the beginning of the article. ② It is in sharp contrast with the purple coat my father made for me, which reflects my father's deep affection for my son. The father struggled to cross the railway, and his love for his son was left. I don't know how to type, so I am very tired.