Correct answer # 2: The world's nations must cooperate; one nation cannot solve the world's problems by itself.
When you connect two related independent clauses or sentences you use a semicolon. Both sentences should be completed grammarly writtend and with a connection. Make sure you do not write a capital letter after the semicolon, unless it is a proper name.
Answer # 3 is incorrect as there is a capitalized word
Answer # 1 it is incorrect to use "for" as the sentence is grammarly completed
Answer:
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C?? not sure what the question marks are
There are lots of reasons why people read. You may simply want to relax, after a long day, I find it quite relaxing to just chill and read for a couple of hours. You can do specific reading, in order to bolster your understanding on a specific subject. We can also boost our vocabulary when reading, we learn new words constantly. You can train your brain, because you need to visualize a whole world while reading. Some people read because it makes them feel good. All in all, books open up a whole new world to the reader, and have many benefits, I've only listed some, and I hope this helps you!