Users practicing this topic

Post date	Users	Rates	Content
Fri, 01/18/2013 - 07:15	Vanan	95	Check this topic
Sat, 10/31/2015 - 16:49	wellington025	90	Check this topic
Fri, 04/05/2013 - 13:15	annisak	70	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