Every few years, the coal workers their lungs X-rayed to ensure their health.
A. are having B. have C. have had D. had had
The plan _________ just because people were unwilling to cooperate (合作).
A. broke down B. pulled down C. turned down D. put down
Jack, I’m afraid I’ll turn to you．I think chemistry is _______ physics．
A．as a difficult subject as B．a subject the same difficult as
C．as difficult a subject as D．the same difficult subject as
Not until then did I find it _____ to do the job that way.
A. is easier B. easier C. was more easily D. more easily
Most of the professors _____ to our school were from South Africa．
A．invited B．to be invited C．being invited D．had been invited
You may take half of the cake; they’re exactly the same.
A. both B. either C. any D. each
