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Jerry is the kind of guy you love to work and live with. He is always happy and always has something 1  to say. When someone asks him how he is doing, he must reply, “If I   2 any better, I would be twins! ”

Jerry is an 3 manager because he has several waiters who have followed him around from restaurant to restaurant. The reason the waiters follow him is his 4 to life. He always  5 others. If a waiter is having a bad day, Jerry is there telling the waiter how to  6the positive side of the situation.

I was very curious(好奇的) about his positive attitude, 7one day I went up to Jerry and asked him, “I don’t get it! You are a positive person 8. How do you do it? ”

Jerry replied, “Each morning I 9  and say to myself, ‘Jerry, you have two choices(选择) today. You can choose to be happy or you can choose to be unhappy. ’I choose to be happy. Each time something bad happens, I can choose to be a victim (牺牲品)or I can choose to learn from it. I choose to learn from it. ”

Life is all about choices. Please remember: “You are what you  10  . ”

如图所示，将小砝码置于水平桌面上的薄纸板上，用水平向右的拉力将纸板迅速抽出，砝码的移动很小，几乎观察不到，这就是大家熟悉的惯性演示实验．若砝码和纸板的质量分别为m₁和m₂，各接触面间的动摩擦因数均为μ．重力加速度为g．要使纸板相对砝码运动，求所需拉力的大小的取值范围．

船夫的驾驶技术特别好。行船的速度极快，来往船只很多，他____，毫不____。不管怎么拥挤，他总能左拐右拐地____过去。遇到极窄的地方，他总能____地穿过，而且速度非常____，还能作____。两边的建筑____地往后倒退，我们的眼睛忙极了，不知看哪一处好。