—You will fail in the exams ________ you work hard.—I know, Dad. I'll try my best.A. if B. unless C. as long as
I really want to know _______.
Now the air in our city is _______ than it used to be. Something must be done to stop it.
You’d better look up the new word in a dictionary _____ you don’t know it ?
If the question ________ incorrectly, _________ question will be given to you.