1.what is the difference between再见,拜拜and 告别?(to say good bye)
we use 再见 and 拜拜 in the ordinary life the say goodbye. 再见 is see you, and 拜拜 is byebye
告别can be a verb or norm, sth like " say goodbye"
2. what is the difference between 其他and 别的?(other)
其他 is much more formal than 别的,
别的is little bit spoken that not good to be used in the formal essay.
3. what is the difference between 挑and 选择?( choose)
选择can be verb or norm, like choose and choice
挑 is a verb, like selet, less formal than 选择