You have____(probable) never heard of Amy Hayes, ____she is a most unusual woman. She never throws away things we____(need) any more. She has always thought about how these things____(put) to good use. She thinks that nothing is a waste. The windows and doors of her house come from old buildings around her town ____were pulled down. The top of ____is an old boat____(turn) upside down. And the gate is made ____rocks and old glass bottles. Amy isn't the only one who is ____(recycle). Jessica Wong uses old clothes to make bags. She ____(do) this for a few years. Her bags are cute and useful.

KOH____CF₄____ BaCl₂____ N₂____ CO₂____．

地质学家在完成对M洲的矿产勘测后惊叹：“这是世界上最富饶的大洲。”社会学家在调查完M洲人民的生活水平后叹息：“这是世界上最贫穷的大洲。”人口学家在测算了M洲的人口状况后感叹：“M洲将成为世界上最大的大洲。”据此回答下面小题。