Misc: in the comic strip 'blondie', who was dagwood's best friend?

Questions

In 1902 Marie and ---------- Curie isolated the radioactive element radium. ?

In 1906 Australian ---------- dies in London Zoo at 26; oldest known marsupial ?

In 1910 Halley's Comet passes ---------- recorded perihelion at 87.9 million km ?

In 1919 Polish Army captures ---------- , Lithuania from Soviet Army ?

In 1920 7th modern Olympic games opens in ---------- ?