20. He looked at us in a ________ way as if we had come from a different world.　

　　 A. curious　　　 　B. crazy　　　　 　 C. frequent 　　　 　　D. familiar

19. The world's economic development is not a win-lose game but one in which all ________ be winners.

A. can　　 　　　　　　　 B. shall　　 　　　C. must　　　 　　　D. would