Sulfur has occasionally been found in the earth in an almost pure state. regularly。 accidentally。 sometimes。 successfully。
Recent studies have posed the question as to whether there is a link between film violence and real violence． supposed。 poised。 aroused。 raised。
The committee was asked to render a report on the housing situation. copy。 publish。 furnish。 summarize。
Schmidt and her colleagues are the first group of scientists studying Europa． Right 。 Wrong 。 Not mention。
请在第_____处填上正确答案。 Still 。 However 。 Moreover。 Thus。
The Country was torn apart by strife.
