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.