Institution: AGRANI BANK LTD Exam: Agrani bank Ltd - Officer - 12.02.2010
Topic: Preposition, Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

The appropriate word to fill in the gap in the sentence "I can't give assurance ----- help" is "of," making the complete sentence "I can't give assurance of help."

Using "of" in this context indicates that what is being assured relates directly to the "help" being discussed. The phrase "assurance of" is commonly used in English to signify a guarantee or promise regarding something specific, in this case, help.

Let's consider the other options:

- **For** would imply an assurance in favor of help but lacks the directedness or specificity needed for the context.
- **About** suggests a general reference to help, but it does not convey the sense of a firm commitment or promise that "of" does.
- **To** is incorrect because it suggests a direction rather than the nature of the assurance itself.

Therefore, "assurance of help" denotes a clear relationship where one is explicitly promising or guaranteeing that help can be expected, aligning with standard usage in English.