求补全该英语短文!

题目

求补全该英语短文!
Perhaps most of you have sent letters or e-mails to your friends or families before.But have you thought about sending a letter to yourself or your friends in the future?These das,more and more young people are beginning to try another________(A.type B.a type C.kinds D.a kind) of mail-future mail.
Future mail lets senders choose the date of delivery.so the letter will reach the address at that special time .Take Miss Feng as an example.The girl is under much pressure from her busy life in Beijing,so she wrote a letter to herself on her 25th birthday and had it deliverd five years later on her 30th birthday through "future mail"."I expressed my ideas about my present life and my hopes for the future to encourage myself to face challenges in life bravely."Feng said.
Some experts think future mail is a(an)_________(A.good B.interesting)way to help people free themselves from pressure and worry.Because they can record,express and share their feelings by writing letter

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