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一道初一的首字母填空Airbagsarealsoveryimportantforcarsafely,becausesometimesaseatbeltisn'te.这个e开头的单词是什么.

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一道初一的首字母填空
Air bags are also very important for car safely,because sometimes a seat belt isn't e_____.这个e开头的单词是什么.

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enough