Nearly 900,000 pupils across Hong Kong schools and kindergartens returned to the classroom on Tuesday for the first time in more than six months, the final phase of class resumption since the coronavirus forced campuses to close.Children from Primary Two to Four, Form Two to Four and Kindergarten K1 and K2 attended half-day classes across the city after a steady drop in infected cases, with those who spoke to the Post excited to be back at school.Pupils in Primary One, Five and Six, Form One,…