Come and see me whenever ____.
_____in the sports world,a sportsman needs to train constantly to keep himself in best condition.
Teenagers ________ their health because they play computer games too much.
Peter’ shirt looked just the same as Tom’s,but it cost ______ his.
We can’t figure out ______ quite a number of insects and birds are dying out.
______ environmental damage is done,it takes many years for the ecosystem to recover.