1. (2021九上·东阳月考) 阅读下面的短文，根据短文内容在表格内的横线上填入恰当的词。每空限填一词。

A material is what something is made of. There are 5 basic materials. Most things are made with these materials. 

Let's talk about metal first. Metal is heavy. And it is very hard and strong. It usually feels cool if you touch it. We use metal to make lots of things. We use it for forks and knives. We use it for keys. We use it for cars. We use it for these things because it is very strong.

Next, let's talk about glass. Glass is very smooth. It also feels cool to touch. It is not as heavy as metal. It is hard. But it is not strong. It breaks very easily! Then why do we use it? We use it because it is clear! You can see through glass! That's why we use it for windows and glasses.

Now, let's talk about wood. Wood is lighter than metal and glass. It is not as strong as metal. But it is much stronger than glass. We use wood to make lots of things. Things made from wood are usually light and hard and strong such as chairs and tables. Pencils are made from wood.

Now let's talk about cloth. Cloth is very light. It is much lighter than wood. And it is very soft. We use cloth to make lots of things. For example, it is used to make clothing and blankets. 

Last, let's talk about plastic. Plastic is also very light. But it is different from cloth. Sometimes it is soft, and sometimes it is hard. Plastic can be used to make thin plastic bags. These are light, soft, and strong. But plastic can also be used to make bicycle helmets. These are light, hard and strong. 

 basic materials

Materials	Characteristic	Usage
Metal	Heavy, hard and strong	Forks,   , keys and cars
Glass	Smooth, hard and clear but break    .	Windows and glasses
Wood	Lighter than metal and glass much    than glass	Chairs, tables and pencils
Cloth	Light and soft	Clothing and blankets
	Soft/hard, light and strong	Bags and bicycle helmets