根據(jù)句蒽及所給單詞的首宇母填空。.
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
1. extinction    2. eastern   3. opinions    4. disappeared  5. chemicals
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