Ihave passed my examination easily, but I made too many stupid mistakes.

It will be my turn. I feel a bit nervous.—________. You can make it.

are some health problems that, when intime, can become bigger ones later on.

I looked everywhere in the house ______ a key that had been lost

填入下面一段文字横线处的语句，最恰当的一句是（ ）随着雾霾频发，油品质量对环境的影响引起了人们越来越多的关注，有测试表明，一些城市空气中PM2．5的20%左右来自机动车尾气，而只要使用符合新标准的汽油和柴油， 。有鉴于此，我国将加快促进成品油质量升级国家专项行动。