Liu Xiang’s Olympic dreams were shatteredforsecondtime when he unfortunatelycrashed at firstbarrier in the ll0m hurdles heats in London．

Jackie, your brother is trying to sleep. Could youplease _______ your radio

Zhang Guorong’s singing career _________ about over 20years. It was his ________ appearance at singing in public.

Look!_____!Do you know them? [ ]

(2013·甘肃兰州名校高三检测)The professor told me to start the research right now, ________ I was sure to fall behind