阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的的正确形式。

Woman: Our design class is really interesting. Don't you think so?

Man: Yeah, I like Professor Vargas, ____ sometimes he goes too fast, and I feel like I'm missing something. There's a lot we have ____ (remember).

Woman: True. There are a lot of details about all the different styles.

Man: Yeah, there are Art Nouveau, and Art Deco, and Art Moderne... I have a hard time ____ (keep) it all straight.

Woman: I know what you mean.

Man: For example, it seems to me ____ Art Deco and Art Moderne are the same things.

Woman: Well, it's somewhat confusing. They were both popular in ____1930s although Art Deco came a little before Moderne. I think Professor Vargas ____ (say) Art Deco started at an exhibition in Paris in 1925. Let me check out my notes. Right, Art Deco was a popular international art design movement from 1923 until the 1940s, ____ (affect) the decorative arts such as architecture and ____ (industry) design, as well as the visual arts such as fashion, painting, the graphic arts and film.

Man: So, they were about the same time. It's one thing that gets confusing. ____ thing is, they seem so similar that it's hard to see why they're ____ (consider) different styles.