We can never expect ________ bluer sky unless we create ________ less polluted world.(2009·安徽)
A．a；a B．a；the C．the；a D．the；the
(2011·浙江)Experts think that ________ recently discovered painting may be ________ Picasso.
A．the；/ B．a；the C．a；/ D．the；a
(2011·山东)Take your time—it's just ________ short distance from here to ________ restaurant.
A．/；the B．a；the C．the；a D．/；a
(2012·安徽)Carl is studying ________ food science at college and hopes to open up ________ meat processing factory of his own one day.
A．/；a B．/；the C．the；a D．the；the
(2012·新课标全国)Sarah looked at ________ finished painting with ________ satisfaction.
A．/；a B．a；the C．the；/ D．the；a
(2013·重庆，32)The parents were shocked by ________ news that their son needed ________ operation on his knee.
A．a；/ B．the; / C．the; an D．a; an
