A hasn't heard B hasn't been hearing
C hadn't heard D didn't bear
A gave B to give
C giving D would give
A he had gone B had he gone
C his going D he went
A come B are coming
C came D have come
A is stoping B stops
C will stop D shall stop
A have been tested B had been tested
C were tested D had tested
A didn't ever meet B have never met
C have ever met D never met
A to get B shall get
C will get D will have gotten
A waited B was waiting
C has waiteD D had been waiting
A will work B works
C will have worked D has worked
Aincrease fossil fuels
Bpurify the w~iter
Csolve social issues
Dprotect environment
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