填treasure（宝藏）
a teenager treats(对待) her diary like a __treasure__ full of secrets that she does not want to share(分享).一个未成年小女孩对待她的日记如同藏满秘密的宝藏一样,她并不希望（和别的伙伴）分享秘密.这句话是一句定语从句,that做secrets的定语share the secrets分享秘密.