натрий сожгли в кислороде..получ.вещ-во обработали углекисл.газом. продукт реакции прореагировал с железом..уравнения написать.Na2CO3+ Fe = ....

use the suitable prepositions. please!!!!!
1.David has a back injury that may prevent him...playing...tomorrow's game.2.I was ashamed...having lied...my mother.3.I'm sorry I haven't been...much help...you.4.Please help youself...more: there's plenty...everything.5.Jane takes...her mother...fact they look very similar...each other.6.He want the sort...person who immediately made you feel...easy.7.Brazil is rich...mineral resources.8.I told her...her face exactly what I thought...her.9.We insist...the highest standards...cleanliness...the hotel.

почему в повести Айтматова "белый пароход" у мальчика не было имени?

что влияет на объём и структуру потребительских расходов