Thanks masaegu san. My ex-先生 said that I would be wrong if I altered 1, 2, 3 to 4, 5, 6. I do not know why though.
Anyway, am I right to say that I should say "昔の日本の絵
がフランスで発見されました" and "国際会議
がこの町で開かれます" if the topics are discussed for the first time?
