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stop riding in cars
take your own bags when shopping
recycle books and paper
throw away
put sth. to good use
The bottles （n.瓶子） aren’t thrown away.
They can be put to good use.
Do you know what they are made of?
Do you know what they are made of?
It is made of fire extinguisher.
It used to be
a keyboard.
president n. 负责人；主席；总统
work n. (音乐、艺术)作品
metal n. 金属
throw away
扔掉；抛弃
pull...down
拆下；拆毁
gate n.
大门
bottle n.
瓶；瓶子
president n.
主席；负责人；总统
inspiration n.
灵感
throw away
put sth. to good use
pull......down