写出下列物质的化学式

①氧化铝______；②氯化铁______；③四氧化三铁______；④氢氧化铜______；

⑤硫酸钠______；⑥氧气______；⑦铁______．

小题1:My father ________(居住) happily with my small family.

小题2:As a teacher, he must be _________(友好的) to all his students.

小题3:I hope ________(每个人) will achieve(实现) their dreams in the future!

小题4:When autumn comes, the ________(叶子) on the trees turn yellow.

小题5:Don’t go to play soccer! It’s ________(下雪) outside now.