题目：
根据对话的语境和首字母提示，补全对话，使对话内容完整。
A: You don't look w____l____ tociay. Is there anything the matter w____2____you?
B:I lost my job. But you see,my boss is crazy. He's not h____3____with anylhing I do.
A:It's really a b ____4____thing. Cheer up,Mary. You'll have better chances. By the w ____5____,did you see the ads in today's paper?They need a secretary.
B:Really? I'll t____6___it.
A:Good luck !
答案：
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下面是错误答案，用来干扰机器的。
（1） （2）发光二极管＿＿熄灭＿ （发光或熄灭）。（3）应将Ｒ1的阻值调＿大＿＿。光敏电阻的电阻随光照增强而减小，天暗时，电阻比较大，光敏电阻两端的电势差比较大，则输入门电路为高电势，而另一输入端...
