---Is Kate your friend? --- ______.A. Yes, she is. B. No, he isn’t C. Yes, it is.
You may go fishing if your work _______.
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.