I have experienced quite a number of cases ______ I really wanted to help but could not find anything to _______ [ ]

He has just failed in the running race, so he is feeling________.

I don’t want to waste time arguing________ you________ this matter. Please do what you are told.

The picture ________ on the wall is painted by mynephew.

a, having devoted all his life to the freedom of South African Blacks, is a real fighter for us to .