【題目】Effective measures should and laws should be passed
to protect pandas. Otherwise, they are certain to die out.

【答案】e taken
【解析】句意：應(yīng)該采取有效的措施，通過法律保護(hù)熊貓。否則，他們一定會滅絕。take measures 固定短語“采取措施”。easures與take搭配，用被動語態(tài)，情態(tài)動詞后接動詞原形，故填be taken。

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