_____ can we protect the environment in our daily lives— As for me, I think we are supposed to use both sides of paper and try not to use plastic bags.

Frankly, I really doubt _________ he will pass the driving test, for he missed much training.

“How did it ________ that the new machine was out of order？” asked the manager.

下列各句中，成语最恰当的一项是①在夏季减肥食谱中，有四种食物位于爱美女士们的黑名单，被排除在减肥食物之外，千万碰不得，否则会让你的努力 ！②可下半场的最后5分钟内，我们差点将全场的努力 ，所以说我们要拿下一场比赛还是要在5分钟之后才能确保，在最后5分钟内，对手有3次很好的机会，如果我们想要成为“英东杯”冠军，就要避免这些状况。③这90户业主不肯退铺，让大华公司以回购商铺的方式解决大润发购物中心困境的努力 。

He talked about a hero ____ no onehad ever heard.