If you know a foreign language you can tell your foreign friends about your family, study _____ [ ]

Your father’s never been to other countries， has he—________. He plans to go abroad for a second time.

Americans eatvegetables per person today ______as they did in 1910.

I was wondering if we could go skating on the weekend.―― good.

填入下面文段空白处的词语，最恰当的一组是（ ）蒋震认为，  ①  从学理上看，税费的专项扣除要充分考虑个人生活的必要成本，  ②  扣除应考虑两点，一是必要性原则，即维持人类生存的基本生活成本，  ③  教育、医疗等；二是公平性原则，即每个纳税人都面临的成本费用类型。  ④  目前不宜参照某些国家以家庭为单位的征收方法，中国人的家庭结构  ⑤  为复杂，等到信息条件成熟之后  ⑥  探讨优化。① ② ③ ④ ⑤ ⑥