Modern equipment and no smoking are two of the things I like ______ working here. But whether to stay or leave is ___________.
One evening when it was swarm, I stayed awake ___________ until half past eleven in order to have a good look at the moon by myself.
Dr. Smith was always__________ the poor and the sick, often providing them with free medical care.
As_______ matter of fact, ________ beauty of _________ nature there made an excellent impression on me.
--- Do you know the Water Cube(水立方)at all? --- No, this is the first time I _________ here.
While having our dinner, _______.