【題目】It is (確定的) that nothing is impossible if we never give up.

【答案】certain
【解析】句意：如果我們永不放棄，肯定沒有什么是不可能的。certain形容詞，確定的、肯定的。句型：be +形容詞+that從句。所以應(yīng)填寫certain。

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