In the exercise, you need to fill in the prepositions: in, with, into, on, during, behind, out, and towards. An example letter from Michael to a friend shares how he got a guinea pig and expresses his initial fears about caring for it. The filled sentences and the letter illustrate Michael's experience with his new pet.
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During a specific time (the afternoon), the preposition 'towards' is suitable for indicating direction. 'In' is appropriate for something held within the arms.
'He put the guinea pig into a cage and then he behind top of the bookshelf by the door.'