句子改错。
I have a headache I didn't sleep good last night.
____
用化学用语填空⑴常用于人工降雨的物质____。⑵2个硫酸根离子____ 。⑶金刚石____。⑷写出过氧化氢的化学式并标出氧元素的化合价____ 。
His terrible look ____ me but I was not afraid. (surprise)
