Dear Sir or Madam:

I am writing to express/air dissatisfaction/disappointment/concern regarding accommodation. I would prefer to move into a single room next semester, as I find the present sharing arrangement inconvenient.

　　I must explain that the reason for my dissatisfaction is my roommates inconsiderate behavior. For one thing, his friends are constantly visiting him; for another, he regularly holds noisy parties.

　　To solve this difficulty/surmount this difficulty/improve this situation/crack this hard nut, I hope to draw the attention of the authorities concerned. I am sure you will agree that the only solution is for me to move into a room of my own. Therefore, 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,

　　Li Ming