It's no use thinking too much about one's ______ youth.
过多地回想已经逝去的青春年华是没有用的。
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The experiment proved(to be)a success in the end.
如没有采取适当防护措施,则应立刻停止焊接作业的情况是()。
A. 环境相对湿度达80%
B. 采用电弧焊焊接,风速达到6m/s
C. 采用CO2气体保护焊接,风速达到2m/s
D. 天气酷热,阳光下地表温度达380℃
The rumor proved(to be)true.
The schoolboys were frozen into complete silence as they saw the ______ look on their master's face.
看到老师脸上露出可怕的表情,男生们立即静了下来。