Fill in the blank with a suitable preposition.
She covered the cake _______ the icing.
The prepositions ‘with’ is used to refer to the tool, material or object used for performing something. In the given sentence, ‘the icing’ is the substance used by the person to complete the cake. Therefore ‘with’ is the suitable answer. Hence option D is correct. On the other hand ‘for’ cannot be used in the sentence because ‘for’ is used to denote why something is done or for whom, for example, "for safety" or "the cake is for her kid". The cake is not covered because of the icing, it is covered using it. Therefore option A is incorrect. Similarly ‘as’ and ‘like’ cannot be used in the sentence because ‘as’ and ‘like’ are used to refer to the character or nature of something, like in “dressed as Santa” or “looks like milk”. Therefore options B and C are incorrect.