You are given an English sentence with a blank, and you need to predict the missing word. After completing, the whole sentence should be gramatically correct and non-ambiguous.
Example: The kid on the street is ____ soccer
Example solution: playing
Example explanation: This is the original sentence 'The kid on the street is playing soccer' So, we have correctly predicted the missing word to be 'soccer'

Problem: it's ____ seldom matthew sets his mind on anything that when he does i always feel it's my duty to give in and as for the risk there's risks in pretty near everything a body does in this world there's risks in people's having children of their own if it comes to that they don't always turn out well
Solution: so