Prepositions: about, of, by 4 * What has Ben got? Look at the list and write He's got or He hasn't got. Then complete the sentences with about, of or by.
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Ответы на вопрос:
Na2o2→na+ o- k2cr2o7→k+ cr+6 o имеет со -2 hno2→h+ n +3 o -2 cs2→ c +4, s -2 ph3→p +3, h -
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