根据括号内的要求改写下列句子。

1. I don't know Japanese, so I can't talk to the Japanese. (改为同义句)

    ________ I ________ Japanese, I would talk to the Japanese friends.

2. I was so anxious that I couldn't sleep. (改为同义句)

    I was ________ anxious ________ sleep.

3. He didn't realize the dangers of the situation at all. (改为同义句)

    He didn't realize the dangers of the situation ________.

4. We should allow twenty - year - olds to drive a car. (被动语态)

    Twenty - year - olds ________ to drive a car?

5. If I don't permit, you can't use my dictionary. (改为同义句)

    You can't use my dictionary ________.

某小组的同学对放置已久的过氧化钠的成份进行探究，请回答下列问题：

（1）反应 2Na₂O₂+2H₂O=4NaOH+O₂↑的还原剂是______（写化学式）；反应2Na₂O₂+2CO₂=2Na₂CO₃+O₂↑中，每生成1molO₂则转移了______mol电子．

（2）进行探究：

①提出假设． 假设1：全部是Na₂O₂         假设2：全部是Na₂CO₃ 假设3：______

②设计方案，进行实验．请在答题卡上写出实验步骤以及预期现象和结论（可不填满）．限选实验试剂和仪器：蒸馏水、1moL•L^-1H₂SO₄、澄清石灰水、淀粉-KI溶液、酚酞溶液、火柴、试管、小烧杯．