某课外小组探究用氧化铁炼铁，他们设计的装置如图：(1)请写出图中炼铁反应的化学方程式。 (2)如何证明反应产物中有铁粉？为防止污染环境，尾气该怎么处理？
He tried to________to cook a meal on the island but he failed.
Bajin, for________experiences were dangerous and unforgettable, was an old man always telling the truth.
________bird flu outbreak has killed 545 chickens and ducks in________central China and led authorities to destroy 2,487 others.
We are all________to see that child________.
The ground is________with________leaves.
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