The difficulty which we had ________ with the local people has now been removed.
A．communicationB．to communicate
C．communicatedD．communicating
Limited natural resources should be made full use of ________ the ________ need of energy.
A．to meet；increasingB．to meet；increased
C．meeting；increasingD．meeting；increased
Measures must be ________ to prevent the world economy from ________.
A．done, further endangering
B．carried, being further endangered
C．taken, being further endangered
D．made, being further endangered
Tony ________ have thought this book was worth ________ or he wouldn’t have read it over and over again．
A．can；being readB．must；to be read
C．may；readingD．must；reading
The chairman thought ________ necessary to invite Professor Smith to speak at the meeting.
A. thatB. itC. thisD. him
She was about to tell me the secret ________ someone patted her on the shoulder.
A．asB．untilC．whileD．when
