35 out of 50
Don't be discouraged! :] Romeo and Juliet - *sigh... I remember those (rather boring) days! :)
Romeo and Juliet are star-cross'd lovers'; they are not in control of their own destinies
I would say that the best way to go about this essay is to look specifically for facts and evidence in the story itself that will support that it was fate that caused their death. One example would be the plague - in the play, the plague forces the priest (was he called the priest?) to detour around the city to inform Romeo about the plan to elope him with Juliet. However, Romeo was hasty and unfortunately the priest could not deliver the message in time. That might be one example. You could find plenty more :]
Once you do this, try to write a killer introduction for your essay, with the thesis saying that Romeo and Juliet were indeed star-crossed lovers.