根据句意和提示写出单词，完成句子。
I don’t think the sweater belong to______(he).
---I passed the last exam yesterday.   
---Oh, you’re really a ______ (luck) dog.
Lily is the ________(bad) of the girls at Maths.
We’ll have a three_________(day) holiday on Tomb Sweeping Day.
Nobody studies as     (happy) as Simon. He really enjoys studying.