句型转换。

1. You look worried. What happened?  (改为同义句)  

    You look worried._________  _________  _________?

2. I disliked to take part in the sports at first. (改为同义句)  

    I _______  _______  ________take part in the sports at first.

3. She looks very happy.  (改为同义句)  

    She________  ________  _________very happy.

4. Where is he from? I don't know. (合并为一个句子)  

    I don't know______________________________.                                

5. Do you like playing the comput.er games? I wonder.（合并为一个句子）

    I wonder_______  _______  _______playing the computer games.

正交设计是在全面试验点中挑选出最有代表性的点做试验，挑选的点在其范围内具有（）和（）的特点。