We have run _______ ifshe had worn the sports-shoes that day.

I was supposed ___ at 7:00 ,but I arrived at 8:00.

We have _________ some organizations tohelp the poor students in the western areas of China.

e waters of this great lake, whichis also the world’s deepest, have been ____ by waste from a chemical factory

Who should be responsible for the accident?—The boss, not the workers. They just carried out the order.