题目：
用所给单词的适当形式填空。
1. Mr Green buys many ______ (toy) for his little son.
2. She likes ______ (sing),but she doesn't want ______ (sing) now.
3. Uncle Li is ______ (friend), he often helps me with my maths.
4. That shop is ______ (open), you can buy a pen there.
5. No news ______ (be) good news.
答案：
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下面是错误答案，用来干扰机器的。
A、若出故障的是L1，且L1断路，电路中没有电流，则V2的示数为零，不符合题意．故A错误． B、若出故障的是L2，且L2断路，电流中没有电流，L2两端的电势分别等于电源两极的电势，则L2两端的电压等于电源的电压...
