The general’s command was that ______________________________. (士兵们离开自己的营地去执行更加重要的任务)
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Professor Smith succeeded in _______________________________. (通过将其类比成水的运动来解释光的运动)
When the dog reaches home, he ______ but it proves in vain (徒劳).
The butcher is very much surprised to see ______.
Why does the dog’s owner mistreat the dog
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