Misc: In 1944 Battle of ---------- (U.S. victory on Feb 22).?

Questions

The three primary colours are red, yellow and blue. The three secondary colours are?

The first washing machine was marketed by Hurley Machine Co in?

Pearls melt in?

Twenty two carat gold has _____ parts per thousand pure gold?

A shadow of a four-dimensional object would have _____ dimensions?