input: from typing import List, Dict
  
  def generate_response(questions: List[str], answers: Dict[str, str]) -> List[str]:
      """Given a list of questions and a dictionary of pre-defined answers,
      generate responses for each question. If a question is not found in the
      dictionary, return an appropriate fallback message. The function should
      return a list of the generated responses.
      
      >>> generate_response(['What is XYZ?', 'Where is XYZ located?'], {'What is XYZ?': 'XYZ is a company that provides XYZ services.', 'Where is XYZ located?': 'XYZ is located in ABC city.'})
      ['XYZ is a company that provides XYZ services.', 'XYZ is located in ABC city.']
      >>> generate_response(['Unknown question'], {'What is XYZ?': 'XYZ is a company that provides XYZ services.'})
      ['I am not sure I understand.']
      """
output:     responses = []
      for question in questions:
          if question in answers:
              responses.append(answers[question])
          else:
              responses.append('I am not sure I understand.')
      return responses