Bill Gates is a r___man in the world.He has billions of dollars

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• Bill Gates is a r___man in the world.He has billions of dollars
• There is __n____ in the fridge.i have to buy some.Bill gates is a very __r___ man in the world.He has billions of dollars._W____ your help,Ican't finish it on time.
• Bill Gates is a r___man in the world.He has billions of dollars
• 根据首字母提示写单词1、Before you enter the teacher's office ,you should k_____ on the door first.2、Bill Gates is a very r____ man in the world.He has billions of dollar3、Mr.Gao is eighty years old,but he has some m_____ ideas.4、Yan Liwei and Zhan Tianyou are national h______.5、Some people are p_____ flowers in the garden.
• Bill Gates is one of the _(rich)men in the world._里应填rich的什摸形式
• 如果方程x的平方+kx+6=0的两实数根为x1和x2,同时方程x的平方-kx+6=0的两实数根为x1+3和x2+3,则k为多少