In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.
Ambition is a vital ingredient for success. Without ambition to push us, we will not be (1)_________ of great achievements. We all need that special something (2)__________ ourselves to give us the willpower to reach a higher goal (3)_________ we imagine ourselves capable (4)_________ Yet, ambition, (5)__________ money and fire, is a good servant, but a bad master.
Select the most appropriate option to fill in blank number 2.