---You don’t seem to be quite yourself today. What’s wrong? --- Oh, I'm suffering from a cold. Nothing serious, ____.
Scientists believe native Americans arrived by crossing the land bridge that connected Siberia(西伯利亚)and more than 10,000 years ago.
------Are you satisfied with the result? -----Not at all.It couldn’t be .
The thief broke in, trying to open the safe, but ___________.
The heart is _________ intelligent than the stomach, for they are both controlled by the brain.
Everyone had an application form in his hand, but no one knew which office room _____.