Answer: These are the correct answers:
1. El armario.
2. El tenedor.
3. El cartel.
4. La pared.
5. El alquiler.
6. El cubierto.
7. La servilleta.
8. La vivienda.
Explanation: Just to elaborate a little on the answers, it can also be added that in this exercise you are asked to select the word that does not belong to the series. The series contain words that describe kitchen appliances, utensils, furniture, and so on. In series 1, for instance, you can find the following words: kitchen, freezer, closet, and oven. In series 2, for instance, you can find the following words: pillow, fork, blanket, and bed. Series 5 is a little bit more difficult, since the unrrelated word—rent (alquiler)—is particularly random.