(2013·西安一中月考)As ________ unemployment is very high at the moment，it's very difficult for people to find ________ work.
A．the；/ B．/；/ C．the；a D．an；the
(2013·昆明二模)The operation is ________ success and the patient is now out of ________ danger.
A．a；the B．a；/ C．/；the D．/；/
(2013·咸阳二模)—Have you seen ________ pen？I left it here this morning.
—Is it ________ black one？I found it in the corner.
A．a；the B．the；the C．a；a D．the；a
(2013·南阳两校联考)Keeping a diary is ________ good habit，by which you'll make ________ great progress in writing.
A．a；a B．a；/ C．the；a D．the；/
(2013·合肥一中二模)I don't know who invented ________ iphone，but I think it is ________ useful invention.
A．the；a B．the；the C．an；the D．an；a
(2013·福建四地六校联考)—Which of the twin brothers is easier to get on with?
—________ younger one.He is ________ most humorous man.
A．A；a B．A；the C．The；a D．The；/
