Joe Smith is a player in a football team．Several____ago，he and his family were taking a holiday in a small town．One rainy afternoon，it was ____for them to play outdoors，so the family decided to go to the cinema．Joe，his wife(妻子)and ____children drove down to the town's cinema．They bought four____and then went into the hall．The lights were still on(亮着)，and there were just____other people there．When Joe walked in．some of them saw him and____lapping(鼓掌)．Joe gave them a smile and turned to his wife，"Ah，what a warm welcome!I can't believe they know me here．"he said．"I____they've seen my games on TV"When they sat down．a young man turned around to shake hands with Joe．"I just can't believe you know____I am，"Joe said．The man ____puzzled(困惑的)．"All I know'"said the man,"is that they said they would not show the film ____at least ten people had bought tickets．"

如图所示，质量M=2kg、长L=4.8m的木箱在水平拉力F₀=66N的作用下沿水平面向右做匀加速直线运动时，箱内质量m=1kg的物块恰好能静止在木箱后壁上；若此物块贴近木箱后壁放于底板上，木箱在水平拉力F=9N的作用下由静止向右做匀加速直线运动，运动时间t后撒去拉力，则物块恰好能运动到木箱前壁．已知木箱与水平面间的动摩擦因数μ₁=0.2，物块与木箱底板间的动摩擦因数μ₂是物块与木箱后壁间的动摩擦因数μ₀的 $\frac{1}{5}$ ，不计木箱壁的厚度、最大摩擦力等于滑动摩擦力，物块可视为质点，取g=10m/s²，求：