The correct answer is:
B. Predicate.
The predicate is necessary to complete the sentence.

Answer:
1. D
2. Unclear, it should say it's but there is an answer choice saying "change its to it's," the article may have been meant to say "its", which would make C correct since it isn't being used as a possessive pronoun. If not, it would be D
3. A (since it is referring to today's as a possessive pronoun)
4. A
5. D
Explanation:
Since there were so many questions included I didn't explain all. If you need anything else further explained let me know in the comments!!
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Answer:
Because of the finite speed of light, when you gaze up into the night sky, you are looking into the past. The bright star Sirius is 8.6 light years away. That means the light hitting your eye tonight has been traveling for 8.6 years. ... When you look at that star tonight, you see it as it was at the time of your birth.
Answer:
The rise of sea levels in coastal areas.
Explanation:
One of the major problems of climate change - especially for low countries boarding to the sea - is the rise of sea level. Several islands have already suffered the consequenses, like loss of homes and/or beaches in coastal areas. The rise of temperatures in coastal areas is a cause for worry but it doesn´t (yet) physically affect people living in coastal areas.
Answer:They Both take place in Neighborhoods and involves music.
Explanation: I just answered a question.