For a long time, many parents worried that teaching a child two languages (1) ____ cause confusion. Modern research, however, suggests exactly the ____₍₂₎. Children who grow up bilingual not only communicate with more people but also tend to develop greater mental flexibility. Constantly switching between languages appears to strengthen the brain in ways ____₍₃₎ improve concentration and problem-solving. Some studies even suggest that bilingualism can ____₍₄₎ the onset of certain age-related memory problems. ____₍₅₎, learning a second language early is now seen as an advantage rather than a burden.

Boşluk (1) için doğru seçenek hangisidir?