∙∙ 1: positive

∙∙ 2: negative

Evidence: Paragraph 2: "At this point, teenagers might experience a change from a positive to a negative mood easily."

*A shift = a change

∙∙ 3: sleep

Evidence: Paragraph 2: "This stage often happens due to various factors such as stress, lack of sleep, daily challenges at school, or even complaints from parents."

*Lack of ... = have little ...

*Stress~stressful, challenges at school~difficulties at school, complaints from parents~parental complaints