Dear Mr. Zhao,
Because I ate too much expired food yesterday, I had a very bad stomachache. I went to see the doctor, and he said that I should stay home. Therefore, I cannot come to class on Monday.
Dear Mrs/Mr Hou ,
I had to ask a lesson for leave.Because I don't feel very good.There is something wrong with my stomach.I think I eat something unhealth.So I want to ask a lesson to go to hopital.
I feel so sorry that i can't work ,because of eating more cold drink.Please let me go back home and have a rest.