       jQuery(this).before(dom)
 
     @$mul.on 'click', ' .delete-choice', ->
-      $choice_answer_indexs = jQuery('.form-question-multi-choice .question_choice_answer_indexs')
+      $choice_answer_indexs = that.$mul.find('.question_choice_answer_indexs')
 
       $delete_checkbox = jQuery(this).closest('.checkbox')
       delete_index = parseInt($delete_checkbox.find('input:first').val())

    that = this

    @$mul.on 'click', ' .add-choice', ->
      $choice_answer_indexs = jQuery('.form-question-multi-choice .question_choice_answer_indexs')
      next_choice_answer_index = $choice_answer_indexs.find('.checkbox:not(.hidden)').length
      dom = $choice_answer_indexs.find('.checkbox:first').clone()
      dom.removeClass('hidden')

    that = this

    @$sin.on 'click', '.add-choice', ->
      $choice_answer_indexs = that.$sin.find('.question_choice_answer_indexs')
      $add = that.$sin.find('.add-choice')
      next_choice_answer_index = $choice_answer_indexs.find('.radio:not(.hidden)').length
      dom = $choice_answer_indexs.find('.radio:first').clone()
      dom.removeClass('hidden')
