Everybody dances. If you have （1)_____ swerved to avoid stepping on a crack in the sidewal

Everybody dances. If you have (1)_____ swerved to avoid stepping on a crack in the sidewalk, you have danced. If you have ever kneeled to pray, you have danced. For these actions have figured importantly (2)_____ the history of dance. Dance goes (3)_____ to the beginnings of civilization—(4)_____ the tribe—where natives danced to get (5)_____ they wanted. Primitive dance was (6)_____ all practical, not the social dancing we know today. Natives approached dance with (7)_____ seriousness as a way to help the tribe in the crucial process (8)_____ survival. Dance was believed to be the (9)_____ direct way to repel locusts, to (10)_____ rain to fall, to insure that a male heir would be born, and (11)_____ guarantee victory in a forthcoming battle.

Primitive (12)_____ was generally done by many people moving in the same manner and direction. (13)_____ all dances had leaders, solo dances (14)_____ rare. Much use was made of (15)_____ part of the body. And so (16)_____ were these tribal dances that, if a native (17)_____ miss a single step, he would be put to death (18)_____ the spot. Fortunately, the same rigid (19)_____ that governed the lives of these people do not apply in the (20)_____ relaxed settings of today's discotheques.

A．ever

B．never

C．before

D．after