________ a certain doubt among the people as to the practical value of the project.
A．It has B．They have
C．It remains D．There remains
It sounds like something is wrong with the car's engine.________，we'd better take it to the garage immediately.(2011·江苏，33)
A．Otherwise B．If not
C．But for that D．If so
________ a strange plant！I've never seen it before.(2011·辽宁，33)
A．Which B．What C．How D．Whether
—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
