It may be necessary to stop _____ in the learning process and go back to the difficult points in the lessons．
A． at intervals B． at random
C． at ease D． at length
The driver stopped his car so _____ that he was hit by the cab right behind him．
A． impolitely B． violently
C． abruptly D． cautiously
None of the students in the class likes the professor， who is used to being _____ of everything they do．
A． optimistic B． criticaL
C． interested D． emotional
Africa is a very _____ continent， with each country， or even each part of a country having its own unique culture．
A． diverse B． abstract C． remote D． vacant
The shooting death of Michael Brown， an 18-year-old black man， who was fatally shot by a police officer， has _____ a media firestorm across the US since Aug 9．
A．set up B．set out C．set aside D．set off
If you completely ____ foods and drinks that you love， you'll only set yourself up to go on a large amount of those items later．
A．take out B．cut out C．give out D．put out
