Although modem organic food has become very popular, many people can' t figure out the difference between organic foods and ______ grown foods．

（2014年安徽省合肥市高三第三次教学质量检测）23. -- Don't you think Carl was brave to go wingsuit flying?-- Personally, I think he was ______. He shouldn’t have risked his life to do so.

The Internet is increasingly accessible at school and at home. _____many parents and teachers are sometimes not as prepared as we should be to warn children about Internet threats.

 December 17, 2011 was a sad day for the North Koreans, ______ their top leader Kim Jung-ill passed away unexpectedly.

My parents will move back into town in a year or _______ .