In fact fuels we burn and plant food we eat ______ their chemical energy in the form of heat.
. “There is a great potential for the development of Sino-U.S. trade, ______ is in line with the interests of the two countries and their people,” Wu said
. The talk between the two leaders aimed at ending the long _____of war between the two countries.
. He seldom listens to others. He ____ answer for what he has done.
. They thought about it for a long time, but still couldn’t ________ a solution.
. Many wild animals in the world _____ , so we must take measures to protect them.