i. Rubber made by vulcanization is a …………… material. ii. Man-made materials are made by …………… natural materials.
Fill in the blanks using proper works:
i. Rubber made by vulcanization is a …………… material.
ii. Man-made materials are made by …………… natural materials.
iii. …………… thread was developed simultaneously in New York and London.
iv. Rayon is also known as …………… .
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