16、Is oxygen the only gas helps fire burn?$ b5 Z M# G w- l. p0 p/ G
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! F1 w; X$ Z2 M' F. w( j17、The Second World War millions of people were killed ended in 1945.3 ?5 v0 T8 t7 l
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# ^& x5 C F2 l0 V- Y. {1 B2 i: ?18、The train she was travelling was late.# m" x' R' o! {1 d+ N4 d% g6 A; u8 ]
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P0 W: J; `; ?8 @$ W19、Winter is the time of year the days are short and nights are long.) ~6 S# g' W0 _, I+ q- v
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20、I’ll show you a store you may buy all you need.6 i0 _* K8 p* m
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