—Mr. Hu, can you tell us how to learn swimming well?—Sure. But remember we can learn nothing well _______ hard work.
He ________be at home because the light in his room is on.
We ________ our hands while they were singing on the stage.
—Have you ever ________ to the Great Wall? —Yes, I _______ there last autumn.
The words _________ by Miss Li are marked ________ red.
Have you finished the work _________?