How do you predict that Okonkwo will react to the events in Things Fall Apart?
For me to predict how Okonkwo will react would give away the ending, but I can give you some hints on what to look for in Okonkwo's character so that you can make a prediction. What have you noticed about his character so far? Chapter 1 gives some detailed information about him - he was famous in his village for his achievements, he had no patience with unsuccessful men, and the author tells us that he was cut out for great things.
As events occur, how does Okonkwo tend to react? Chapter 2 tells us Okonkwo had a fear of failure and weakness, so he reacts to everything with outward confidence, pride, and often anger.
Another important question to ask yourself is whether or not you notice any changes in Okonkwo? If so, what causes him to change? If not, why not?
By analyzing Okonkwo's character traits, it will help you to make predictions of how he will respond to all the events of the novel. Below is a link to some more discussion of Okonkwo's character.