4. Reference Words (Найди в тексте синонимы или объяснения к словам из wordlist.) "Tough challenges" относится к: "Boosting their careers" связано с:

Решение:

• "Tough challenges" относится к: Qualification rounds (as elimination rounds are tough challenges).
• "Boosting their careers" связано с: skill certification (as certification can help advance one's career).

Ответ: Qualification rounds; skill certification.