Ⅰ. 单项填空（共15小题；每小题1分，满分15分）
1. Due to the heavy rain and flooding，ten million people have been forced _________ their homes.
A. leaving B. to leave
C. to be left D. being left
2. The moving picture of a little boy of 5, _________ from the big earthquake, has been made _________ to all Chinese people for the boy’s saluting to the soldiers.
A. saved; to know
B. to save; knowing
C. having been saved; know
D. saved;known
3. The faces of four famous American presidents on Mount Rushmore can be seen from a _________ of 60 miles.
A. length B. distance
C. way D. space
4. He paid for a seat，when he _________ have entered free.
A. could B. would
