—Why does the lake smell terrible?
—Because large quantities of water ________.
A．have polluted B．is being polluted
C．has been polluted D．have been polluted
(2011·江苏)The fact that so many people still smoke in public places ________ that we may need a nationwide campaign to raise awareness of the risks of smoking.
A．suggest B．suggests C．suggested D．suggesting
(2011·湖南)One－third of the country ________ covered with trees and the majority of the citizens ________ black people.
A．is；are B．is；is C．are；are D．are；is
The basketball coach，as well as his team，________ interviewed shortly after the match for their outstanding performance.(2012·陕西)
A．were B．was C．is D．are
All the scientific evidence ________ that increasing use of chemicals in farming ________ damaging our health.(2012·湖南)
A．show；are B．shows；are
C．show；is D．shows；is
Walmart，which is one of the largest American supermarket chains，________ some of its stores open 24 hours on Mondays through Saturdays.(2012·安徽)
A．keeps B．keep C．have kept D．had kept
