i'm writing a ___ to my sister for the birthdqy present she sent me

i'm writing a ___ to my sister for the birthdqy present she sent me
i'm writing a ___ to my sister for the birthdqy present she sent me

i'm writing a ___ to my sister for the birthdqy present she sent me
letter.我在写一封信给我姐姐因为她送我的生日礼物

letter