阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。
Green is not always referring to the color. In some cases, it is the term used for environmentally (1) (friend). If you've been expecting to replace your furniture, consider (2) (go) green because green furniture offers many benefits. Here are a few tips to get you started on your hunt for the perfect eco-friendly furniture.
First, green furniture isn't harmful (3) your health. Also its making process doesn't cause damage to the environment in any way. Besides, by using eco-friendly (4) (product), you prevent global warming to some degree in your own way.
The materials (5) are used in furniture are what make them green. Materials can be good for the environment (6) because they are renewable resources or because they are all (7) (nature). A lack of chemicals in furniture also (8) (mean) it is a better choice for the environment. It may be hard to imagine that a sofa or a table could actually be (9) green product, but they really can be depending on what they (10) (make) of.
Therefore, when you want to hunt for the perfect green furniture, you should choose the green materials.