表达观点：重要的发明 — 英语词汇题
题目
根据中文提示写出所缺单词，补全表达观点的句子：
1. The I____（互联网）is an important i____（发明）because it helps us get information quickly.
2. I b____（相信）the printing press was really i____（重要的）in history.
3. In my o____（观点），the a____（飞机）is one of the most useful inventions in the world.