1. The soldiers who survived WW1 and came back to become drunkards.
2. He wrote it in two of his books, and attributed it to Gertrude Stein.
3. She was an art patron. Since she had a lot of money, she could buy paintings from important artists, and also support artists that were going to shine.
4. It was her house where Mrs. Stein gathered art forms of all American and international modern artists. 
5. A person who works/lives in a country that is not his own.
JaviUri 