You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: HOLIDAYS AND OBSERVANCES 
Clue: The name of this Jewish holy day means "beginning of the year"
rosh hashanah

Category: ANCIENT GREEKS 
Clue: This actor of the 6th century B.C. is credited with introducing the use of masks on stage
thespis

Category: MUSEUMS 
Clue: This city's Accademia features work by native sons Giorgione & Canaletto

venice