В схемах уравнений химических реакций вместо вопросительного знака вставьте формулы соответствующих веществ,расставьте коэффициенты:
? + NaOH -> Cu(OH)2 + Na2SO4
P2O5 + ? -> Na3PO4 + H2O
H3PO4 + ? -> Ca3(PO4)2 + H2O

What (happen) to you since she (leave)? I (think) ypur daughter (become) a real beauty since I (see) her last. What you (do) with the knife? The point is broken off. For these last three years I (save) hearly every penny for my trip to that country. Well, dear, what you(do) all day long? You (look) tired. Come and sit hereby the fire. Hello, he (say) holding out his hand, I(look) for you for a long time. I never (have) the chance to thank you for what you( do) for my brother. You se, I (do) this kind of thing for the last thirty years. I(think) of it ever since Molly (tell) me about your decision to go to sea. You(live here ever since you(leave) Canada? Do come in and joing us. We (have) coffee and (watch) TV.