1. 经过多次徒劳的尝试后我正要放弃时,我的老师来帮助我 了.( be about to)
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2.人们认为乡下的空气要比城里的更清新.(It is thought)
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3.实验室发生火灾后,许多设备都被毁坏了.(equipment)
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4.其他学生都紧张,但由于这是我第二次,我很轻松、自信. (独立主格)
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5.我回到了我度过幸福的童年的故乡.(where引导定语从 句)
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