 Complete the following phrase:  Krzewina appeared on the national junior scene in 2007, placing third at the national junior championships in the 400 metres. He dipped under 48 seconds in the event for the first time that year. He won his first international selection at the 2007 European Athletics Junior Championships as part of Polands 4×400 metres relay team. The team including Jan Ciepiela, Sebastian Porzadny, and Marcin Klaczanski reached the final, but was disqualified. His first individual international race came the year after at the 