问题详情：
根据句意和汉语注释，写出单词的正确形式。
1. Excuse me, sir, but you are not __________（允许）to smoke here.
2. When and where to have a spring trip is under__________(讨论) this evening.
3. Thank you for giving us so many good __________ (建议).
4. On Friday, many students are __________（困倦）after a long week than usual.
5. The goal of this experiment is not to carry people, but to just make the balloon ________（漂浮）high.
【回答】
1. allowed 2. discussion 3. suggestions 4. sleepier t
知识点：单词拼写
题型：单词拼写
