When one wishes to analyse a subject you must do what at great length? - look at - use calculator - come to conclusion - learn new - think about  The best answer is
think about

It turned out it wasn't a kidney stone, what might it have been a stone in? - gallbladder - creek bed - driveway - river bed - gravel  The best answer is
gallbladder

What do you need to write a letter? - have paper - literate - not give up - move fingers - to keep warm  The best answer is
have paper

Playing piano and other creative activities need what? - make music - inspiration - musical sounds - making music - dancing  The best answer is
inspiration