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Sure, I'd be happy to help you with the use of "Although," "Though," and "Even though." "Although," "though," and "even though" are all used to introduce a subordinate clause that contrasts with the main clause. They can be used interchangeably in most cases, but there are some subtle differences in usage. 1. Although he is very poor, he is an honest man. 2. Though it was raining, we went for a walk. 3. Even though she had studied hard, she didn't pass the exam. Now let's move on to your writing exercises: 1. The correct answer is C: The train arrived while Elizabeth was writing a note to her friend. 2. The correct answer is D: Although the water is very cold in January, we go swimming anyway. 3. The correct answer is A: Since the water was very rough, the lifeguards made all of the swimmers leave the water. 4. The correct answer is B: Mike goes jogging two miles every morning before he gets ready for work. 5. The correct answer is D: Going to the movies is still much cheaper than going to a concert although ticket prices might be more expensive. 6. None of the options provided seem to correctly combine these two sentences into one coherent sentence. However, a possible combination could be: "Before flying back to Ho Chi Minh City at 7 pm, we went to Dong Xuan Market." 7. The correct answer is A: You need to plan your trip to South America carefully so that you don't spend all your money too quickly. I hope this helps! Let me know if you have any other questions or need further clarification!