分解因式：$x^2-2xy+y^2+x-y$=____

把下面的句子补充完整。

①  金鱼在水里摆____摆____。

②  他使劲的盯着窗户，不____不____地就睡着了。

A

    No one knows what our life will be like in the future. Here are some children's1

Cindy:In the future, people will have more holidays. They will2a lot of time traveling (旅行) around the world. Maybe some families will go to the moon

3their holidays.

    Gary:I think the earth will be more crowded and polluted. Maybe some people will4their houses on other planets.

    Sarah:Students in the future won't need to go to school and they will study at home. What will happen5students have problems with a subject? They wil

6with a teacher through videoconferencing (视频会议).

    Peter:In the future, people will speak fewer languages. Maybe there will be

7one language in the world. And it will be much8for people to talk with each other.

Laura:Robots will play an important role in our life.9will help humans do all kinds of work.

    These predictions may seem impossible today, but I10they will come true one day because we never know what will happen in the future.