20.—Is that Dec. 21, 2012 is the end of the world true? —Definitely not, but________must be paid to the global climate change.
______ was the Saturday , we were facing.
Mr. Wang was such a good teacher _______ the students respect.
-----Mr. Chen is a teacher and works very hard. -----_______ his wife.
_______ he has been chosen to work as a teacher in the mountain village ______ him feel very proud.
----- Has any of you reached the Great Wall ? -----________.