Users practiced this topic

Users	Post date	Rates	Link to Content
Priya Patel	2014-03-21	90	view
Taniazehra	2018-03-25	80	view
ali.darudi	2013-11-28	80	view
raghu18	2017-07-19	83	view

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: TOEFL