All theories______from practice and in turn serve practice.

____ marriage is practiced in almost all countries of the world, the customs are quite different from one culture to another.

The millions of calculations involved, ______ by hand, would have lost all practical value

The course ________ a class book, a practice book and an audio tape.A. highlightsB. mak

The millions of calculations involved ______ by hand would have lost all practical value

Have you ever wondered what our future is like? Practically all people【C1】______a desire t

Dozens of scientific groups all over the world have been ______ the goal of a practical an