Prepositions: By, Of, In, With

Fill in the gaps with the correct preposition.
Remember: BY is used to give credit or name the cause of an action, especially in passive constructions. BY is also used to state a method used.
IN can be used to name a material or medium used. OF is used to name the subject of a book, a painting, etc.
WITH can be used to name what specific tools or equipment was used to do something.

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  1. The choir sang _____ harmony.
    1.   by
    2.   in
    3.   of
    4.   with