How do you pass level 8 in rubble trouble moscow?

put 1 nitro on the LEFT side of the barrels on the metal bar on the top do the same to the other side but on the RIGHT. Then put 1 on the concrete below the green boxes and do the same to the other side. PRESS DESTRUCT and the fire will burn up the wood houses and the boxes add on to you supply and then you should have enogh to advance to the next level.