_________ is known to all, the moon travels round the earth once every month.
| A．It | B．As | C．That | D．What |
People of different countries and regions, different nationalities and cultures have formed with solidarity an Olympic family, ______they have deepened understanding and enhanced friendship.
| A．when | B．which | C．that | D．in which |
It is said that Chinese students tend not to challenge authority or _____different opinions and prefer to accept other’s views.
| A．speak | B．distinguish | C．say | D．air |
If there is an intruder _____the campus, students should be _____through an announcement, ______teachers should lock their classrooms to keep the children safe.
| A．in, warned, after that | B．at, warned, before which |
| C．on, informed, after which | D．in, informed, before which |
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.
| A．left, to follow | B．concluded, following |
| C．had left, following | D．had concluded, followed |
. 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.
| A．on the edge of | B．in the way to | C．about to | D．due to |