We often_ some beautiful cards for our teachers on Teachers'Day.A,make;B,send

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• Christmas is coming.My class want to______ some cards for our teachers.A.make B.take.C.have
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• We often_ some beautiful cards for our teachers on Teachers'Day.A,make;B,send
• We often_ some beautiful cards for our teachers on Teachers'Day.A,make;B,send
• We give our teachers some cards ___ best wishes A.in B.for C.by D.with
• We give our teachers some cards ___ best wishes A.in B.for C.by D.with请说明为什么
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• 设x,y,满足约束条件x+y-2≥3,x-y≥-1,2x-y≤3,若目标函数z=ax+by的最大值为10,则5/a+4/b的最小值为