1 . 选择并使用所给英语单词的正确形式完成句子，有两个单词为多余词。

approach, depend, fortunate, flexible, enable, misunderstand, chat

1. The economy of that country is heavily ____________ on natural resources.
2. When we met again 20 years later, we ____________ a lot over tea.
3. Listen! Someone ____________ our classroom.
4. I was late, but ____________ the meeting hadn’t started.
5. What a shame! We ____________ each other for such a long time. I wish I had communicated with you earlier.

2 . As we become more and more ________(depend) on computers, some scientists are urging us to think about the dangers from the advances in AI. （所给词的适当形式填空）