Dear Mr.Brown,
I am sorry to t___ you my mother is ill.She c_day and night .She does not l__down and have a rest .My father is not in .He w__to Beijing last week. My mother can not look after h _. The doctor gives her some ___( 建议).she should stay in bed and __(服用) some medicine .So I have to take c__of her._ _ (可以)I  ask for a day’s  leave?
Thank  you.
Yours  s_____,
Tom