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Paul: Look! This is called a 1_______.
Helen: By the way, what 2_______ is it made of?
Paul: It is made of plastic.
Helen: Why is it made of 3_______?
Paul: Because plastic is a 4_______ material, it is lighter than steel. And it is the least expensive material. Therefore it is used for making rulers.
Paul: Look! This is called a 1_______.
Helen: By the way, what 2_______ is it made of?
Paul: It is made of plastic.
Helen: Why is it made of 3_______?
Paul: Because plastic is a 4_______ material, it is lighter than steel. And it is the least expensive material. Therefore it is used for making rulers.
• ruler
• plastic
• material
• light