Đọc đoạn văn và trả lời câu hỏi sau : Who writes the letter? 

Đọc đoạn văn và trả lời câu hỏi sau : 
Dear Sir / madam
I am writing to you about the short stop of your trucks around my house on their way to the north.
When the trucks of your company have a short break on the streets around my house , the drivers have left lost of garbage on the ground after their refreshment . when the trucks leave the place , the ground is covered with trash and a few minutes later there is smell and filies.
I would suggest that your company should tell your drivers to clear up all the trash on the ground before leaving .
I look forward to hearing from you and seeing good response from your company .
Yours faithfully,
Tran vu nhat
Questions 
1. Who writes the letter? 
2. What is it about ? 
3. Why does he write it?
4.Is there smell and flies after the trucks leave?
5. What should the director tell his drivers to do?