If there is an intruder _____the campus, students should be _____through an announcement, ______teachers should lock their classrooms to keep the children safe.
Leaders of the BRIC countries-----Brazil, Russia, India and China----_______their second summit on Friday. President Hu Jintao then returned home to help direct relief work ______the deadly earthquake in Qinhai.
. Lion: Want to have a fight, little dog? Dog: No. I don’t want to fight an animal that is ______extinction(灭绝). My master told me that we should protect endangered animals.
Stanford opened its doors in 1891 and more than a century later, it remains _____finding solutions to the great challenges of the day and to _______ its students for leadership in today’s complex world.