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Once a philosopher was travelling down the river in a small boat. While he (cross) the river he

(ask) the boatman: “Your ever (hear) about Philosophy?” “No,” (say) the boatman. “I never

(hear) about it. What (be) it?” “I (be) sorry for you, indeed,” replied he learned man, “you (lose)

a quarter of your life as it’s a very interesting science!” Several minutes later the philosopher

asked the boatman another question: “You (hear) about Astronomy, when you (be) at school?