Users practicing this topic

Post date	Users	Rates	Content
2017-03-14	Sura1988	76	Check this topic

Topic title: Recently, there has been a debate about a sound had been detected by a Russian submarine, it is like frog sounds, so they called it (quaker). Until now there is no one know the source of this sound, some scientists suggest many theories explain this phen

Topic category: Integrated TOEFL Writing