Ⅰ、1、play;hurt
2、are used
3、has worked
4、to spend
5、would be covered
6、was set
7、be cleaned
8、is sleeping
9、have eaten
10、are/were asked
Ⅱ、1 - 6 C C C A B C
Ⅲ、1、used to watch
2、was bought
3、may be visited
4、have never seen
5、are flying
6、mustn't be thrown
7、is wasted