You will find ______ useful to learn even a little English.
—Mr. Hu, can you tell us how to learn swimming well?—Sure. But remember we can learn nothing well _______ hard work.
You _______ wash your hands before meals. It is good for your health.
It’s hot here. Please keep the windows _______.
Sally sings pretty _______ and she is also _______ at dancing.
The summer holiday is coming. We’re going to have _______ holiday.