题目：
用所给单词的相应形式填空。
1. Everything ______________ (go) well.
2. Five years ago，he ______________ (live) in Shanghai, but now he ______________ (be)
in Wuhan, maybe in five years he ______________ (move) to Nanjing.
3. There ______________ (be) seven days in a week.
4. The students will go to the Summer Palace if the rain ______________ (stop) tomorrow.
5. The man is not a doctor now, but he ______________ (be) before.
6. One of my e-pals ______________(keep ) a pet snake in his house.
7. We can use the knife ______________(cut) apples.
8.When ______________ you ______________(begin) to be a volunteer(志愿者)？
答案：
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下面是错误答案，用来干扰机器的。
（1）绳子自由端拉力的功率为48W；（2）此滑轮组提升重480N的物体B匀速上升时，此滑轮组的机械效率为80%．（1）因为η= W有用/W总=G/nF，所以F=G/nη=360N/3×75%=160N手拉绳子的速度为v=3×0.1m/s=0.3m/s，拉力...
