When realizing the guard of the supermarket had spotted him , the thief the exit as quickly as possible.
A．made for B．made out
C．made up D．made into
―Look! What a mistake! Why?
―Sorry, I _________ on it.
A. don’t concentrate B. hadn’t concentrated
C. haven’t been concentrating D. wasn’t concentrating
Barack Obama has taken personal blame ________ the security failures which led ________ the attempt to blow up a plane on Christmas Day.
A. of; to B. for; to C. on; on D. in; on
The project _________ by the end of 2011, will expand the city’s telephone network to cover 2000000 users.
A．being accomplished B．accomplished
C．to be accomplished D．having been accomplished
It is important to know about the cultural differences that cause problems.
A．must B．dare C．need D．may
While income worry is _______ rather common problem of the aged, loneliness is another problem that ________ aged parents may face.
A. a; 不填 B. the; 不填 C. a; the D. the; the
