Although my grandfather is in his eighties, he is still as ________ as a young man and hates sitting around doing nothing all day.

I think watching TV every evening is a waste of time—there are ____ meaningful things to do.

— How was your job interview?— Oh, couldn’t feel ______. I hardly found proper answers to most of the questions they asked.

I don’t think it is __________taking the trouble to explain the question to him. 

I wonder why Jack always gets good marks when he does only ________ the others.