20世纪初，提出光量子假说，解决经典物理学无法解释的光电效应问题的科学家是[ ]

补全对话。 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，并在答题卡上将该项涂黑。选项中有两项多余选项。（共5小题；每小题1分，满分5分）
--- Hi, David. You look so happy! Why?
--- I have just finished a short play.    小题1:  
--- I’m writing a love story, but after the first few pages I just couldn’t write any more.
--- The same thing often happens in the middle of my writing.    小题2:  
--- Then how should we solve it?
--- Well, take me for example.   小题3:  Seeing anything interesting happens, I write it down, even it doesn’t make any sense.
--- Does that work for you?
---   小题4: 
--- Then what is the way out?
--- I usually take a walk in a park and enjoy the sunshine and clean air.   小题5:  
--- Great! Your measure sounds good. I hope it will work for me.