    Sentence 1: World demund increased the.  growth of the motor-car-and-electrical Industries,  and. ‘sky-rocketed -duying ‘World. War. |. By 1920,  Malaya was. producing. 83 percent ‘of the-warld’s  rubber, .which:had:dvertakeii tin as its main source:  of-income:              Sentence’2: The lack of interést:relegated ‘Mataya's.  fubber production to.beiing a naveltiy: