Correct Answer - Option 4 : with
The correct answer is 'with'.
- 'Dispense with' is a phrasal verb which means 'to get rid of or do without something'.
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Ex: Let’s dispense with the formalities and get right down to business.
- The speaker is asking the listener to get rid of his services.
- The verb 'Dispense' forms no phrasal verb with any other prepositions given in the options.
The complete sentence is : You must dispense with his services.
- To some, the answer can be 'of' as dispense of and dispense with both means to get rid of.
- But dispense with (Something/somebody) means to get rid of or stop using something or someone that you do not need where as dispense of means to get rid of something usually by throwing it away.