When a voter receives a ballot, or set of ballots, such voter shall go promptly and directly to one of the voting booths and mark the ballots therein. No voter shall be allowed to occupy a booth already occupied by another voter. No voter shall be allowed to occupy a booth more than 10 minutes if other voters are waiting to occupy the same. The voter shall mark the ballot by making a cross or check mark in the voting squares at the left of the names of candidates.