首段：
Thank you so much for...
I am writing to express my thanks for...
I am writing to extend my sincere/hearty gratitude/appreciation for...
I would like to convey in this letter my heartful thanks to you for...
I warmly appreciate your hospitality.
中间段：
Thank you very much for the gift you sent me.Ii's one of the most wonderful gifts I got on my birthday.
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