问题详情：
用括号内所给单词的适当形式填空。
1. We’ve discussed for a long time. Now it’s time to make a ________. (decide)
2. I really enjoy the weather. The sun gently shines through the ________. (leaf)
3. Switzerland is a ________ country and it is famous for making watches. (Europe)
4. From now on I’ll live on the ________ floor of this tall building. (fifteen)
5. It is necessary to learn how to make requests ________. (polite)
【回答】
sion es pean eenth 5. politely
知识点：构词法
题型：完成句子
