Uncle Sam sent him a _______ bicycle as a birthday present

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• 根据文章内容及首字母提示填空.Today is a s___ day.Peter and Mum are going shopping.Now they are in the supermarket.Peter sees a bicycle.He wants to b___ it,because he can ride a bicycle very well.Today is Peter's birthday.So Mum gives the bicycle to Peter as a present.After Peter goes back home,he rides the bicycle on the grass.His f___,Mary sees and says to him:"The grass wants to g____.Don't ride on the grass.You can ride your bicycle on the p____".Then Peter goes
• many birthday presents ___ him A.send B.send to C.were sent D.were sent to 1.I can't find my bicycle It must ___A steal B been stolen C have stolen D have been stolen2.Many birthday presents ___ himA.send B.send to C.were sent D.were sent to3.I didn't hear the phone I ___ asleepA must be B can be C must have been D can have been4.While she ___ ,her mother was watching TV.A slept B is sleeping C was sleeping D has slept5.Beer ___ alchol.A contain B con
• Uncle Sam sent him a _______ bicycle as a birthday present
• 两个大小相同的金属小球,分别带有3Q和Q电量,当他们相距为r时,他们之间的库伦力为F,则当他们之间距离为2r时,他们之间库伦力大小变为___.若将它们相互接触后再相距r时,它们之间库伦力大小变为___或____.
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