Entering the room, I found Mary _______ at the desk and _______ a letter.
Chinese students usually spend ______ the students of the US studying in their free time.
. She has a strong belief that she will ______ her country to take part in the Olympic Games.
With all his efforts, ______ he made such great progress.
______ is even more important is that water began to appear on the earth’s surface.
I regret ______ you that you have not been chosen for the performance.