roman ivlev, gymnasium number two in vitebsk, geography teacher sergei nikolaevich krivenko.er yanka kupala in the city of mozyr , chemistry teacher karina vladislavovna rataika. alexandra bulova, gymnasium of the city of petrikov and english teacher irina mikhailovna ragalevich. angelina botvich, secondary school number two named after masonov, svisloch , class teacher, geography teacher, vladimir fedorovich osiyuk. arina budnik, gymnasium number 9 named after kirichenko. nakarpenka, secondary school number 31 in the city of mogilev, history teacher natalya ivanovna shakhovskaya. elizaveta mazheika, secondary school number 28 in the city of mogilev, choreography teacher lyudmila nikolaevna golperina. i have one more person left to introduce, this is our scientific expert ekaterina duko. head of the department of methodological support for mathematical and natural science education, academy of education. arising of controversial situations, it is she will decide whose side is right. hello guys, i wish you only positive emotions, interesting questions, correct, precise answers