二、单项填空(共15分)21. ---I’m sorry I shouldn’t have laughed at you the day before. --- _________ .
During the last three decades, the number of people participating in physical fitness programs ________ sharply.
You can imagine the difficulty they have ________ such a large population.
____ apple fell from the tree and hit him on ______ head.
Now when people refer to England you find Wales______ as well.
The teacher _____ the class______ five groups.. A divided...into B. separated...from C. separated...into.. D. divided...from