15. "¿Qué debemos hacer para ayudar el medio ambiente?"

"Creo que ______ protegerlo."
a. vale la pena
b. tenemos
c. vamos
d. forma parte
Not sure..

16. Gregorio _____ tocar la guitarra. La toca muy bien.
a. sabemos
b. sé
c. saben
d. sabe
C or D

18. "¿Debo separar el vidrio y el aluminio?"
"Claro que sí. _________"
a. Sepáralas
b. Sepárala
c. Separa
d. Sepáralos
A or D? Not sure..

19. Dicen que la fábrica es el mayor peligro, pero no _________ por qué.
a. decimos
b. sabemos
c. hacemos
d. vale la pena
Not sure..

21. ¿Crees que las fábricas son ____ para el medio ambiente?
a. puras
b. una amenaza
c. contaminadas
d. buenos
D? or B..

Gracias!!
-MC

Question answers:

15. A
16. D
18. D
19. B
21. B

15. Often you can eliminate some, even if you can't figure out the right answer. tener takes que before an infinitive and vamos takes "a" so both are out. Yes, A.

16. C is out because it is plural, leaving D.

18. Why are you not sure? el vidrio y el aluminio = los.D for sure.

19. B. They say but we don't know why.

21. B a threat.

By now you should be able to guess a lot better. "I'm not sure" is NOT an answer!

Sra

15. To determine the correct answer, we need to understand the context of the sentence and the intended meaning. The phrase "Creo que ______ protegerlo" suggests that the missing word should be a verb related to protecting the environment.

Option a. "vale la pena" means "it's worth it," which doesn't fit grammatically in this sentence.
Option b. "tenemos" means "we have," which is not a verb related to protecting the environment.
Option c. "vamos" means "we go," which is not a verb related to protecting the environment.
Option d. "forma parte" means "is part of," which is not a verb related to protecting the environment.

Based on the context, the correct answer should be a verb. The appropriate verb would be "debemos" (which means "we should") to complete the sentence. Therefore, the correct answer is option b. "tenemos."

16. To determine the correct answer, we need to identify the subject and the form of the verb that agrees with it. The sentence states "Gregorio _____ tocar la guitarra" which implies that it is about Gregorio's ability to play the guitar.

Option a. "sabemos" means "we know" and does not agree with the subject "Gregorio."
Option b. "sé" means "I know" and does not agree with the subject "Gregorio."
Option c. "saben" means "they know" and does not agree with the subject "Gregorio."
Option d. "sabe" means "he/she knows" and agrees with the subject "Gregorio."

Based on the subject and sentence structure, the correct answer is option d. "sabe." Gregorio knows how to play the guitar.

18. To determine the correct answer, we need to identify the appropriate verb command or imperative form. The question asks, "¿Debo separar el vidrio y el aluminio?" which translates to "Should I separate glass and aluminum?"

Option a. "Sepáralas" means "Separate them." It is referring to multiple objects and does not match the context of the question.
Option b. "Sepárala" means "Separate it." It is referring to a singular object and does not match the context of the question.
Option c. "Separa" means "Separate." It is the correct form to address the command or imperative to separate.
Option d. "Sepáralos" means "Separate them." It is referring to multiple objects and matches the context of separating glass and aluminum.

Based on the context and the objects mentioned, the correct answer is option d. "Sepáralos."

19. To determine the correct answer, we need to understand the statement and the context. The sentence says "Dicen que la fábrica es el mayor peligro, pero no _________ por qué," implying that the speaker or the subject of the sentence does not know the reason.

Option a. "decimos" means "we say" which does not match the context of the sentence.
Option b. "sabemos" means "we know" and matches the context of not knowing the reason.
Option c. "hacemos" means "we do" which does not match the context of the sentence.
Option d. "vale la pena" means "it's worth it" and does not match the context of the sentence.

Based on the context, the correct answer is option b. "sabemos."

21. To determine the correct answer, we need to understand the question and the context. The question asks, "¿Crees que las fábricas son ____ para el medio ambiente?" which translates to "Do you think factories are ____ for the environment?"

Option a. "puras" means "pure" and does not match the context of the question.
Option b. "una amenaza" means "a threat" and matches the context of the question.
Option c. "contaminadas" means "contaminated" and matches the context of the question.
Option d. "buenos" means "good" and does not match the context of the question.

Based on the context, the correct answer is option b. "una amenaza."