【推荐1】We are destroying our best fighters against pollution. （对划线部分提问）
________ ________ you ________?

【推荐2】fighters, our,   are, best, pollution, destroying,   we, against（连词成句）
_______________________________________________________________.

【推荐1】The headmaster made a wonderful speech to all the parents and students.(改为被动语态)
A wonderful speech ________ ________ by the headmaster to all the parents and students.

【推荐3】Randy took some heavy coats to keep warm in cold weather.（改为被动语态）
Some heavy coats __________ __________ by Randy to keep warm in cold weather.