As nobody here knows what is wrong with the machine, we must send for an engineer to ______ the problem.

Why not__________ your new ideas? Otherwise you will never know whether they are possible or not. [ ]

Which one can I take—-You can take__________ of them; I’ll keepnone

The secret of happiness is to treasure the things you have now. But someone won’t know it _______ they lost what they own.

下面语段中加线的词语,使用不恰当的一项是( )“双节”长假首日,全国各地相当多的高速公路因免费通行成为中国式拥堵中的一道别样风景,专家认为中国高速公路全面取消收费必须循序渐进,不能企求一挥而就。相关机构应该关心的是,免费之后该怎样治理拥堵也不能因噎废食,让拥堵成为继续收费的理由。