---We all know that __________ a foreign language requires time and effort (努力).
During the Spring Festival, the heavy snow stopped many people from ____ back home.
–When did the Olympic Torch Relay start in Fujian? –____ May 11th, 2008.
There was an exciting moment in our class when a large bird flew ____ the room.
___ now on, I will learn English in the mornings.
They are doing much better ___ Math ___ the help of their teacher.