In the middle of the night, we ______signals for help from another ship.
I don't like to travel to big cities because it seems to me that one city is very much like___ .
----It shouldn’t take long to clear up after the party if we all volunteer to help. -----That’s right.______________.
By improving reading skills, you can read faster and understand more of _______ you read.
Now everyone is concerned about how to conquer the economic crisis, __________is very important for us to preserve our standard of living.
___________ the chapter four times, and I finally understand the author’s theory.