【答案解析】Dear Sir/Madam,
I am writing to express my dissatisfaction about accommodation. I would prefer to move into a single room next semester, as I find the present sharing arrangement is inconvenient.
I must explain that the reason for my dissatisfaction is my roommate"s inconsiderate behavior. For one thing, his friends are constantly visiting him; for another, he regularly holds noisy parties.
To solve this problem, I hope to draw the attention of the authorities concerned. I would be grateful if you could find a single room for me, preferably not in the same building but as near to the college campus as possible.
Yours sincerely,
Sam