问题详情：
根据句意及首字母提示填写单词。
1. It's p________ to say “Excuse me” when you ask for help.
2. This answer is wrong. That one is c________.
3. It's my last r________. I'll never ask you anything again.
4. Dale wants to go to Peter's house，but he doesn't know the a________.
5. It's expensive to go there by taxi. You should go by u________.
【回答】
te ect est ess 5. underground
知识点：单词拼写
题型：完成句子
