The first answer is "Puedo."
"Poder" (an irregular verb) is conjugated in first person present tense to "puedo," so the sentence will read: Can I go on the excursion with you? We can infer from the rest of the sentence that this person is asking for permission to do something with other people, which is why first person make sense.
The second answer is "puede."
This verb conjugation corresponds to Gabriela, who is in the third-person singular box (if you're not sure, change "Gabriela" to "she"). The sentence will read: Gabriela cannot come.
The third answer is "pensamos."
"Nosotros" signifies first-person plural, so we know the ending is going to be -amos. Although "pensar" usually means "to think," in this case it means "to plan," so the sentence will read: We plan to leave at 12.
The fourth answer is "queremos."
Assuming that the sentence says "Alejandro y yo," this signifies another first-person plural conjugation (if you're not sure, change "Alejandro and I" (Alejandro y yo) to "us" (nosotros)). Since "querer" is an -er verb, the conjugation ending will be -emos.
The fifth answer is "pueden."
This verb corresponds to the word "ustedes" (you plural), which is a third-person plural conjugation. The ending is thus -en, and the sentence will read: Can you return at 2?
ingularity is referred to a quantity, which approaches infinity as another parameter goes to zero. An example is a black hole, in which a very large mass gets concentrated in so short a distance that gravitational forces become infinite and all matter and energy (including light or electromagnetic energy) cannot escape it. At this level all physical laws break down.
A quasar is a point-like source that is associated with radiatively efficient emission of an active galaxy, which means that its central black hole and is undergoing high rates of mass accretion. They are typically among the most distant objects we can observe and have highest red shifts and thus on the fringes of universe.
