After a short rest, the workers kept on _____ till midnight.

Come and visit me whenever _______

The headmaster asked the boy to apologize ______ the teacher _______ what he had done, but he refused to

_____ is known to all, the age _______ children can go to school is seven.

It is generally believed that constant reading andcomprehending can ______ our mental ability of comprehension while physicalexercise can help build up our body.