根据对话内容，从对话后的选项中选出能填入空白处的最佳选项，并将答案写在本题下面的横线上。选项中有多余选项。

A:What’s your opinion about this design? 　小题1:　

B:I have never seen a better one.　小题2:　

A:Thanks.I was afraid that you wouldn’t like it.

B:Really?　小题3:　

A:We will have to hire some famous models for the advertisement.

B:It may cost a lot.but it will really bring in more benefit for us.　小题4:　

A:Who do you like better,the models from home or abroad?

B:I think models from home may be more popular among the young.They may bring better results.

A:That’s true.　小题5:　 OK,let’s choose the best models now.

美国最先进的高科技及产业是：（），（），（），（）