句型转换。按要求完成下列句子，每空一词。
1. Jim was walking in the street when he saw a UFO last night. (对画线部分提问)
_____ was Jim _____when he saw a UFO last night?
2.I'm sure robots will make humans lose their jobs. (改为一般疑问句)
_____ you _____ robots will make humans lose their jobs?
3. He saw a UFO. A UFO was flying over the building. (合并成一个句子)
He saw a UFO _____ _____ the building.
4. Robots can do a lot of hard and boring work instead of us. (改为同义句)
Robots can _____ the _____ of us to do a lot of hard and boring work.
5. It took me two hours to do my homework.(改为同义句)
I _____ two hours _____ my homework.