Дополните диалог: Paul: Look This is called a 1_______. Helen: By the way what 2_______ is it made o...: ответ на тест 933023 - Английский язык

Дополните диалог:
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.