―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
—Please sit down and have a break. You have been working on this machine
nonstop for two hours.
—No, thanks. .
A．I’m not in the least tired B．I’m too tired to move
C．I’m not a little tired D．I’m a bit tired
