Writing. write an essay discussing the advantages and disadvantages of space tourism. use the plan provided: introduction introduce the subject of the essay and both sides of the topic. main part (2 paragraphs) present the advantages in one paragraph and the disadvantages in another paragraph. cover both sides of the topic equally. use linking words/phrases: to list points: firstly, first of all, to begin with, secondly, also, in addition, what is more. finally, lastly, etc. to express contrast: however, on the one hand. on the other hand, etc. conclusion make a general statement. use phrases like: in conclusion,. to sum up. state your opinion if you want to, use phrases like: