Definition: a written message that you send to someone, usually in the mail Level: A1
我每周都会给奶奶写一封信。
I write a ___letter to my grandma every week.
她正在给父母写一封家书。
She is writing a ___letter to her parents.
他收到了一封来自家乡的信。
He got a ___letter from his hometown.
