The document is a series of examples that test the use of different prepositions in sentences. For each example, the reader is prompted to choose the best preposition (A, B, C, or D) to complete the sentence. The correct preposition is then provided. The examples cover common uses of prepositions like "of", "for", "about", "with", "into", "on", and "to". The purpose is to help the reader learn and remember common preposition pairs through these practice sentences.