I would go with D. Only hard work and effort can bring success.
Answer:
(from wikipedia) " In linguistics, a register is a variety of a language used for a particular purpose or in a particular social setting."
Explanation:
D. it shows how the author is trying to crack a joke.
Answer:
Yes, it is a good idea. It's even better if you know the most commonly used language of whatever place you are traveling to. Like if you were to travel to France it's a good idea to be fluent in French.
The answer is B for appeexxx