I soon found that the work I was doing had already been done by someone else —________ I was wasting time.
More than thirty students competed____ each other in the composition competition. But they could only compete____three medals.
Red____happiness, and people would surely use it on festival days.
Moved by his words, most of the people of the village____the missing child.
Most of the people____the race but none of them won it.
The plan____no improvement, that is to say, it can't be improved any more.