Read the following passage about humanoid robots and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 18 to 22.

TikTok is a popular app for sharing short videos. It is used by millions of people, especially teenagers. The app, (18) _______ , lets users create clips using music, filters, and special effects.
TikTok brings many benefits. It (19) _______ . Many also use it as a platform to raise awareness about social issues or share useful information in fun and engaging ways. In addition, it gives young people a space to show their talents and explore trends.
However, the app is not without its problems. Some young people spend too much time on the app. Spending hours creating and editing content every day (20) _______ . This can lead to anxiety or low self-esteem, especially if their videos don't get many views or likes. Some users may also become overly focused on online validation rather than real-life relationships.
(21) _______ , parents and teachers can help them enjoy TikTok while staying focused on their studies and mental health.
(22) _______ , TikTok is likely to remain a big part of youth culture in the years ahead.