Don’t be nervous. Professor Liu is really easy to .A、come up with B、get along with C、catch up with
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.