He_______have been here two hours ago, but he hasn’t_______by now.

The doctor suggested he ______.                   

 Mr. Li, a man calling himself Smith wants to see you. ________ he come in?

---Do you feel like walking to the cinema or      we take a bus? ---I’d like to walk. But since there isn’t much time left, I’d rather we      a taxi.

Without electricity human life＿＿＿＿＿＿＿quite different today.