Comprehension:

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 1.