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One of the questions that is coming into focus as we face growing scarcity of resources of many kind...

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play a part in  play role in   joins in  take a part in  
the interviewer can ask the interviewee questions again in different ways  the interviewer can ask the interviewee some personal questions  the initial question do not produce the information desired  no one is present to clarify questions  
have       has         have been         has been       
  
the interviewer can ask the interviewee questions again in different ways  the interviewer can ask the interviewee some personal questions  the initial question do not produce the information desired  no one is present to clarify questions  
what    this    that    which  
/; a   the; a   /; the   /; /  
which    each of them    each of which      they each  
what    this    that    which  
have   has    have been   has been  
asking    to ask    to be asked    asked  
what    this    that    which  
least    much    more    less  
on  against  the monment of  before  
alone    off    out    over  
least    best    more    much