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Laura, just tell them that you have to take the bus to work because you cannot drive and the buses stop running at 7 PM, so unless one of them would like to offer you a ride you will have to leave by 6:30 so that you can catch a bus back home. Or you could ask your sister or parents if they would be willing to come pick you up from work after 7 PM, whenever it is you get out. That way you could ride the bus to work, then get picked up by one of them from work and not have to worry about taking the bus home. Good luck with that!