根据句子意思和所给的首字母写出所缺单词。 1. Oxygen (氧气) is a kind of u_______ ga

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根据句子意思和所给的首字母写出所缺单词。

1. Oxygen (氧气) is a kind of u_______ gas.
2. The Yellow River is the s________ longest river in China.
3. I think it u________ to see the ghosts (鬼). You must be joking.
4. There are many a_______ who want to fly to the moon.
5. I felt surprised and scared when I saw the t________ monsters.

1. useful 2. second 3. unbelievable 4. astronauts 5. terrible

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