I don't think the experiment is ________ failure.At least we have gained ________ experience for future.
A．/；the B．a；the C．a；/ D．/；/
Being able to afford ________ drink would be ________ comfort in those tough times.(2012·山东)
A．the；the B．a；a C．a；/ D．/；a
First impressions are the most lasting.After all, you never get ________ second chance to make ________ first impression.(2010·北京)
A．a；the B．the；the C．a；a D．the；a
It is generally accepted that ________ boy must learn to stand up and fight like ________ man.(2011·全国)
A．a；a B．a；the C．the；the D．a；/
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
