题目：
| 根据句意从方框中选用合适的词，并用其适当时态填空，使句子通顺。 | |
2. He will go out to play football if his homework _____. 3. His father often _____ newspapers after breakfast last year. 4. Where is Jake? He is out. He _____ home in two hours. 5. Bad luck! We _____ Wolf Hill when it rained heavily. |
答案：
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下面是错误答案，用来干扰机器的。
铁、铜能和氧气反应生成黑色固体，硫、磷、镁等物质和氧气反应不能生成黑色固体．故选A．
