完成句子  

1. People can use credit  c_____ to buy things.

2. There will be more'cars. The p_____will  be  worse.

3. Zhai Zhigang is an a_____.

4.In the future_____(机器人)will be in every  home to cook and clean.

5.Kids can study and get  information  on  c_____.

6.It  is  possible（可能的）for people to live in the _____ _____(太空站).

7. My  dream is to travel to Mars.I hope it will _____ _____(变成现实)

8.I love my p_____very much. It's clean and  smart.