根据句蒽及所给单词的首宇母填空。.

1. Do you wonder about the cause of their e_____?

2. Qingdao is in the e_____ part of China.

3. The two countries have different o_____ upon who owns this island.

4. The magic coin d_____ when he put away the cover.

5. The poisonous c_____ are very dangerous