What is the center, main force, slogan and method of the first stage of the May 4th Movement?

Main force: I think it's the bourgeoisie (because the book says that in the second stage, the proletariat began to enter the political arena and become the main force of the movement, so on the contrary, it's the bourgeoisie ... but I'm not sure)

Slogans: "Fight to the death, give me back Qingdao", "Take back Shandong's rights", "Refuse to sign at the Paris Peace Conference", "Abolish Article 21", "Resist Japanese goods", "Fight for sovereignty outside, and get rid of national thieves inside".

Mode: demonstration, police raid, boycott of Japanese goods ... (uncertain)

Results: It won the support of student unions all over the country.