It took him two and a half year to bulid the building 改错

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• It took him two and a half year to bulid the building 改错
• It took him two and a half year to bulid the building 改错
• 【单项选择,要说为什么选这个答案】 It took the workers half a year（）the high building.【单项选择,要说为什么选这个答案】It took the workers half a year（）the high building.A.builds B.to build C.building D.buildMr.Wan is our head teacher and I’m afraid of（）.A.he B.him C.his D.herHave you heard such（）news before?A.an exciting B.exciting C.an excited D.a excitingTo make our city more beautiful,paper（）into the river.A.needn’t be thrown B.mustn’t be thrown C.can’t throw D.may not throw-Lisa
• 已知a+(1/a)=-2,则a^2008+(1/a^2008)=?,(1/a^2007)+(1/a^2008)-(1/a^2009)=?
• 函数y=4的x次方减去2的x次方的单调递增区间是多少?