按要求完成下列各题。

1. I went to Qingdao last Sunday. (对画线部分提问)

2. We gave our fish and chips to Jim. (改为一般疑问句)

3. Mum cooked Chinese food for me. (改为将来时)

4. He drank milk last night. (改为否定句)

5. She gave Sam a bowl of noodles. (改为同义句)

营房区的架空线路距房顶20cm以上，裸露处或接头均用绝缘胶布包好，为什么？