our country must be able to keep pace technologically

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• our country must be able to keep pace technologically
• 帮我看看我的英语作文的语法错误(我初中水平)Olympic Games is window,i keep watch.this is a big window.through it,i can see are worlds.here it is changing every day.our country becoming more and more beautiful.some people are start learning english.there is old man and children.to be a chinese we must learning english to meeting 2008 olympic games.
• —Must we do something to keep our country clean?—__________.
• We must keep our country_______. A.cleaning B.clean C.to clean D.cleaned
• —Must we do something to keep our country clean?—__________.A.Yes,you needn't.B.Yes,we need.C.Yes,of course.D.No,we mustn't.这题.有些特别,所以请说明选哪个不选哪个,为什么不选那个
• We must keep our country_______. A.cleaning B.clean C.to clean D.cleaned
• 已知集合A={1,3},A并N={1,2,3},求符合条件的集合N的个数
• 表达于谦不同流合污志向的诗句是：