按要求完成句子。
1. The road is three kilometres long. (对画线部分提问)
________________ is the road?
2. It is an elephant. (改为一般疑问句)
________________ an elephant?
3. This book is very interesting. (改为复数句子)
________________________ very interesting.
4. of, the, east, Qingdao, China, in, is (.)(连词成句)
____________________________________________
5. The football is under the bed. (对画线部分提问)
________ is the football?