【題目】Let's do everything we can (protect) the animals and plants.

【答案】to protect
【解析】句意:讓我們盡可能做一切事情來保護(hù)動物和植物。we can 是定語從句,前省略了that。不定式to protect 在句中作狀語,表示目的。故填to protect.

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