根据句意及所给提示，补全单词或用单词、固定短语、固定搭配的正确形式填空。
1. We stood on the playground and watched the national f______ going up.
2. Don't forget to______ (关) the lights when you leave.
3. Which is ______ (heavy), your bag or her bag?
4. He has ______ (长大). He can help with some housework.
5. Tom came in ______ (twelve) in the long jump.
