My English teacher had a trip to the USA last summer. Which picture did she take there?
Follow your teacher’s advice, _______ you’ll make great progress in your English.
You _______ write the poem down. Our teacher will give us a copy.
Knowing how to _______ a map can help you when you are travelling in a strange place.
Now the air in our city is _______ than it used to be. Something must be done to stop it.
—The books are so nice, which one can I take? —Oh, you can take _______ of them. I’ll keep none.
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