The answer to 12 is C. And the answer to 13 is A i think.
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I think using your smartphone when you’re with other people is rude, but sometimes its hard to avoid. Its something that has become natural. If one person in a group is using their phone, that opens the door for others, who may start to think it’s socially acceptable just because they keep seeing people do it.
The answer should interrogative verb.
I would say D because when learning a term, the most important thing to understand is what it means. pronunciation and spelling and why it's used aren't necessary for understanding a concept
