Hey dear, you actually put it only at the end. When you put it at the front, then it goes separated from the word. I don't know what is the rule for that, but it has to do with different tenses, for instance in the imperative it goes at the end, while in present or past it goes at the front. I suggest you make a specific question about a case in which you have to say it, so I can tell you which one and why.
Answer:
B. lo
Explanation:
it is masculine and singular.
Answer:
Cómo sobrevivir la clase de español
Sí
Toma notas.
No
No te distraigas.
Cómo pasarlo bien en esta ciudad
Sí
Visitas el Museo.
No
No te quedes en el hotel.
Explanation:
The statement is correct, in Spanish ¿Cuál? used with interrogation marks is applied to question in which a decision should be made. For example:
¿ Cuál es el mejor restaurante en Bogota?
¿ Cuál es la peor película que viste en el 2017?
When we are asked these kind of questions with need to provide an option in the answer. Let´s take the first example; the question would be "Which is the best restaurant in Bogota?" so you need to provide the name of the best restaurant for you.<span />