猜谜。
A riddle
Hello, everyone. I'm a word. I have three letters. My first letter is in “soon” but not in “moon”, my second letter is in”rose” and also in “rice”, my third letter is not in “pencil” but in “paper”, my whole is a place where there is a lot of water. I am the twin sister of the “see”. Who am I?
谜底：I am “____________”.