Question

correct the sentence each of the drawers have a separate key​

Answer 1

Answer:

I expect that all the people who voted is are from west of the Atlantic Ocean (US or Canada). This is an area where British and American usage differs.

See the article Differences in American and British English grammar - article, in particular the section Verb agreement with collective nouns.

Since I am also west of the Atlantic, I also prefer is here but Brits and Aussies, not to mention other followers of British usage may disagree.