鹦鹉、野鸭和鹤属于____。

根据汉语提示写出单词或补全句子。

①____ (也许) we should buy some more beef.

②The Spring Festival is one of the ____ (传统的) Chinese festivals.

③Listen! The music shop is playing a ____ (唱片) of Mozart.

④There is a gym in the____ (中心)of the school.

⑤Do you like taking a____ (慢的)train to travel in the country?

⑥除了音乐，她还喜欢旅游。　____music, she likes travelling as well.

⑦李雷出生于中国的首都北京。　LiLei ____ Beijing, the capital of China.

⑧冼星海以歌曲《黄河大合唱》而闻名。Xian Xinghai ____ the song The Yellow River.

⑨请带你的朋友到花园四处转转。Please____ the garden.

⑩在5岁时，他和父母搬到了广州。　____，he moved to Guangzhou with his parents.

用化学用语填空：
（1）正三价的铝元素____；

（2）2个镁原子____；

（3）5个甲烷分子____；
（4）实验室用过氧化氢与二氧化锰制氧气的化学方程式____。