Answer:
1. por último
2. peinarse
3. el despertador
4. quedarse
Step-by-step explanation:
1. In this group words are related to times of the day; in the morning in the evening in the evening (por la mañana por la noche por la tarde); finally it (por último) has no relationship.
2. In this group, the words are related to sleeping or waking up; lie down wake up fall asleep (acostarse despertarse dormirse); combing (peinarse) is unrelated.
3. In this group, the words are related to bathroom articles; shampoo soap towel (el champú el jabón la toalla) ; the alarm clock (el despertador) is unrelated.
4. In this group, the words are related to personal grooming; shave bathing make up (afeitarse bañarse maquillarse); the verb stay (quedarse) has no relation.