President Nicolas Sarkozy of France has been taking intensive English lessons in order to _____ his guests during his state visit to the UK.

So seriously _______ in the accident that he was sent to hospital at once.

omewhatbetter ________ academically, he returned home to continue his research

下列各句中加横线成语的使用，全都正确的一项是( )①钱钟书先生用文言写成的《谈艺录》《管锥编》博大宏深，其用词运斤成风，最可表现文言词汇的活力和生命力。②点开广东省编办官方网的“机构编制实名制信息公开”专栏，48家省直机关及其下设机构的名称、5 000多名公务员姓名等信息昭然若揭。③新“国八条”出台后，国务院派出八个调查组，分赴全国各地对先前出台的楼市政策产生的效果顺藤摸瓜，以便了解新变化制定新政策。④如果把现代化建设比作一首气势磅礴、波澜壮阔的交响乐，青年农民工就是其中最激昂、最有青春气息的乐章。⑤中国石油与化工联合会的资料披露，与三大石油公司的投资成本相比，三大石油公司的投资收益却很不尽人意。⑥有些出版社只认题材不辨真伪，致使一批并不具备写作资质作者的文字行销书市；不止如此，更有的出版社粗制滥造。

My brother has been teaching ________ he was 21 years old.