It must have been lots of fun riding round in a car.–Yes, you know this was the first time that _____ round in my own car

下列各句加点成语的使用，全都正确的一项是 ①1月16日，50余位国家元首、政府首脑和国际组织主要负责人，数以千计的全球商业精英纷至沓来，出席世界经济论坛2017年年会。②在大众传播媒介高度发展的今天，“名人”辈出，而过去要成为名人必须在某一领域出类拔萃，才能通过薪火相传、书籍记载等方式广为人知。③在跨年雾霾中，防霾产品种类繁多，花样翻新，但是经科学研究证明，许多被宣传得天花乱坠的产品纯粹是无稽之谈。④他读了青年作家郝景芳的获奖科幻小说《北京折叠》后，掩卷沉思，惊觉人生如梦，白云苍狗，因此不必执念太多，要学会放手。⑤特朗普早在大学时代就孜孜不倦地汲取商业领域新知，加上父亲耳提面命的教诲，年轻的特朗普就已蠢蠢欲动，欲在商界闯出一片天地。

The train ________ they were travelling was late.[ ]

Where and when to go for the holiday still ______.

ng was caught in a snowstorm yesterday．—I have known that, and ______ his new carwas completely destroyed．