Users practicing this topic

Post date	Users	Rates	Content
2016-08-26	heidary-222	80	Check this topic
2017-10-14	ferisotoudeh	80	Check this topic
2016-12-09	paras001	78	Check this topic
2016-07-11	ameri	60	Check this topic
2018-09-21	luga	80	Check this topic
2018-01-08	sadeer	80	Check this topic
2018-01-29	julieXD392	90	Check this topic
2017-01-28	dhani	78	Check this topic
2016-10-21	nasimn	60	Check this topic
2018-10-25	Arni	73	Check this topic
2016-08-28	mgrajapt	83	Check this topic
2018-10-15	Salu	80	Check this topic
2018-08-29	prem123	85	Check this topic
2018-03-19	saf1990	80	Check this topic
2017-01-03	-vv-	76	Check this topic

Topic title: Car manufacturers and governments have been eagerly seeking a replacement for the automobile's main source of power, the internal-combustion engine. By far the most promising alternative source of energy for cars is the hydrogen-based fuel-cell engine, wh

Topic category: Integrated TOEFL Writing