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unit 1 communication is the key to success unit 2 emotions have taught mankind to reason unit 3 education is the transmission of civilization unit 4 work to become, not to acquire unit 5 while there's life, there's hope unit 6 life well spent is long unit 7 all holidays can be good times unit 8 travel is more-than the seeing of sights unit 9 sports are a microcosm of society unit 10 character is long-standing habit unit 11 love is the fruit of marriage unit 12 money isn't everything unit 13 success is sweet unit 14 no environment = no development unit 15 problems are the price of progress unit 16 cultural diversity shapes national character unit 17 calamity is man's true touch-stone unit 18 science and technology revolutionize life unit 19 best is cheapest unit 20 the present is pregnant with the future scripts and keys