Supply missing part with the most appropriate word or worlds based on the context. The janitor of the school works at the school since 2015.At present,the still

Supply missing part with the most appropriate word or worlds based on the context. The janitor of the school works at the school since 2015.At present,the still works there.He will get refired by 2019.This years the janitor of the school ....... there for about 3 years.