66．After Dolly the sheep came into this world, the efforts of many scientists　　　　　　 .

65．This policy cannot be criticized　　　　 customer satisfaction．

64．These courses are designed to help you make greater progress 　　　　your current level.

63．Bell never　　　 to invent the telephone and what he was trying to design was a multiple telegraph.

62．The immigrants always try to　　　 the customs and traditions in their homeland.

61．Did you find the map　　　 by the young traveler when he was hiking in the mountains?

60．You can　　 one other class member if you want.

59．I walked on tiptoe towards the woods，for we were afraid our 　　　will frighten the birds away.