Mr. Zhang once taught in a remote village in Anhui province as a volunteer, which was ______ only on foot.
. Today, when I think of my friend, I remember the way her face _____ when she saw the picture of a dramatic landscape.
. No.50 High School is as new as No.48 High School.____, it is more beautiful.
. We’ve published large quantities of books This year _______we’ve published three million copies.
. I’ll go to America to strengthen my English _______it isn’t too expensive.
. These achievements_______ without the contribution of Qian Xuesen, a key leader of the New China's nuclear, missile and so on.