.(辽宁卷26). Doctors say that exercise is important for health, but it _______ be regular exercise.
However,at times this balance in nature is _______ resulting in a number of possibly unforeseen effects.
The visitors here are greatly impressed by the fact that_______ people from all walks of life are working hard for_____ new Binhai.
It was required that the tall building _______ at present because it is still new.
This box is so heavy that he cannot lift it. ________, he is only a ten-year-old child.
In this country, coal electricity.