—Mr. Hu, can you tell us how to learn swimming well?—Sure. But remember we can learn nothing well _______ hard work.
What were you doing ___it was raining outside?
---Oh, it’s raining outside. Don’t leave ____ it stopes.
Please _________ early tomorrow, mum.
The students stopped __________ when the teacher came in.
She often ______ Beijing at the weekend last year.