【正确答案】Dear Sir，
As a student of this university, I would like to take the opportunity to express my appreciation for your kind assistance as always. Meanwhile, I feel that it would be beneficial to express my views concerning the quality of the library service.
In the first place, I find that most keyboards of the library computers are in poor operation, which brings much inconvenience to the users. I would also recommend the library to improve the efficiency of purchasing new books and subscribing academic journals. Lastly, I want to say the reading rooms need to be furnished with a better lighting system.
I hope that you take my suggestions into serious consideration.
Yours sincerely,
Li Ming