Viết lại câu mà không làm thay đổi nghĩa: Is Jim worse at Math than John?;Is John; Jim looks much younger than his classmates; Jim’s classmates;Your hair is longer than mine;My hair

1.Is Jim worse at Math than John?
→Is John
2. Jim looks much younger than his classmates.
→Jim’s classmates____________________________
3.Your hair is longer than mine.
→My hair_________________________