Final answer:
The student's sentences can be completed correctly with the prepositions on, at, in, for, into, since, by. These prepositions help specify place, direction, time and manner in the sentences.
Step-by-step explanation:
The sentences can be completed using appropriate prepositions as follows:
- The cat was sitting on the window sill.
- It looked out of the window at a bird.
- The bird was eating in the garden.
- The cat watched the bird for two hours.
- A man saw the cat go into the garden.
- The man sat on a chair.
- He had been there since lunchtime.
- He was in the living room.
- His chair was by the fireplace.
- There was an old newspaper on the table.
Prepositions are words that specify place, direction, time and manner, and are crucial in the construction of clear and correct sentences in English.
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