My father ____(mend )his model plan these days用什么时态

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• My father ____(mend )his model plan these days用什么时态
• 初中英语的几个句子问题This is so difficult a problem that few of us can work it out.(为什么要有a,可不可以so difficult a换成such)Fran,with his two sisters,is leaving for London by train which leaves at 8:00 next morning,（为什么用这样的时态）Great changes have taken piace in our province.Many tall buildings have been set up.(为什么是这样的时态）Roller-skating is a sport that people of all ages can enjoy.(为什么用that,不可以what)Sam is my best friend whose father is very tall.(为什么是whose,最后再给我说说,做这种题的技巧
• 若高压锅盖的面积约为450cm²,当国内蒸气的压强达到1.6个标准大气压时,锅盖与锅体间的拉力为（ ）N.（已知外界大气压为1个标准大气压,1个标准大气压的值可近似取100000Pa.
• （2006•顺义区一模）甲、乙两个长方体，由不同材料制成，其中底面积分别为S甲=40cm2、S乙=30cm2，高度之比h甲：h乙=3：2，密度之比为ρ甲：ρ乙=3：1，若把甲放在水平桌面上，乙放在甲上，