dear mr chen,
i'm sorry to tell you that i can't go to school today. i've caught a cold because i swam in the kunming lake yesterday.[转
this morning i had a headache. after taking my temperature, my mother found that i had a high fever. she took me to see a doctor. the doctor advised me to stay in bed for two days.
now i'm writing to you to ask for two days' sick leave.
yours respectfully,( )