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Post date	Users	Rates	Content
2013-04-05	annisak	70	Check this topic
2015-10-31	wellington025	90	Check this topic
2013-01-18	Vanan	95	Check this topic

Topic title: Using the main points and examples from the lecture, describe the two kinds of rock formations in a cavern, and explain how the professor helps his students remember the different between the two.

Topic category: TOEFL speaking