The blank should be filled with the preposition that correctly completes the sentence according to standard English usage.
Let us examine each option:
Option (1): on
"On" is used to indicate a surface or position. It does not fit the sentence correctly.
Option (2): with
"With" indicates accompaniment or possession. It is not suitable in this context.
Option (3): For
"For" is the correct preposition because it expresses the intended meaning in the sentence and forms the appropriate grammatical construction.
Option (4): At
"At" is used to indicate a specific place or point. It does not fit the given context.
Therefore, the correct answer is: \[ \boxed{\text{For}} \] Hence, the correct answer is Option (3) – For.
Choose the meaning of the underlined word.
The teacher reiterated the importance of steady and hard work for getting through the examinations.