The problem with being a time waster is _____the online game playing often spills over into the periods of time that should be productive.

   A. what     B. which    C. that     D. whether

 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.

   A. Actually    B. Generally     C. Surprisingly    D. Unfortunately

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

 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.

A. devoted, prepare       B. dedicated to, preparing  

C. dedicating, prepare     D. devoting to, preparing

 I didn’t quite follow him because he explained the theory _____that is too abstract for me.

   A. out of the way   B. on the way    C. in a way    D. by the way

The public transport system in Beijing is very good now, so there _____be any difficulty in traveling around the city.

   A. couldn’t    B. mustn’t    C. needn’t    D. shouldn’t