此作文满分10分我能得多少?
DearMaria,
ThankyouverymuchforhopeIjoinyourbirthdayparty.Butmyfatherandmotherareoutonbusiness.Theyaregoingtocomebackhomenextmonth.Andmygrandfatherfellill.Hestayinbed.SoIhavetotakecareofhim.AndImuststudyforthecomingmid-termexam.Ican'tjoinyourbirthdayparty.I'mverysorry.IjustwriteE-mailtoyou.
Happybirthdaytoyou!
Yours
LiuYing