Fill in the following blanks with suitable words :
(a) Synthetic fibres are also called .......... or ....... fibres.
(b) Synthetic fibres are made from raw materials called .......
(c) Like synthetic fibres, plastic is also a ........
(d) The use of plastics can be reduced by using bags made of ........ or ......... instead of polythene bags.
(a) Synthetic, man-made
(b) petrochemicals
(c) polymer
(d) cotton, jute