To make members of a team perform better, the trainer first of all has to know their ______ and weaknesses.
_____is a good of exercise for both the young and the old.
________more attention, the work would have been done better.
Most air pollution is caused by the burning of _________ like coal, gas and oil.
I bought a dress for only 10 dollars in a sale; it was a real _________.
—Shall we go out for a walk? —Sorry. This is not the right _________ to invite me. I am too tired to walk.