Final answer:
The appropriate prepositions for the given sentences are: on, at, in, for, into, on, since, in, by, and on.
Step-by-step explanation:
1. The cat was sitting on the window sill.
In this sentence, the appropriate preposition to use is 'on' because the cat is positioned directly on top of the window sill.
2. It looked out of the window at a bird.
Here, the correct preposition is 'at' because the cat is directing its gaze towards the bird.
3. The bird was eating in the garden.
The appropriate preposition in this sentence is 'in' because the bird is physically located inside the garden while eating.
4. The cat watched the bird for two hours.
In this case, the correct preposition is 'for' because it indicates the duration of time the cat spent watching the bird.
5. A man saw the cat go into the garden.
The suitable preposition to use here is 'into' as it implies movement from one place to another.
6. The man sat on a chair.
In this sentence, the appropriate preposition is 'on' because the man is positioned directly on top of the chair.
7. He had been there since lunchtime.
The correct preposition to use here is 'since', indicating the starting point of the man being there.
8. He was in the living room.
In this case, the suitable preposition is 'in' as it specifies the location where the man was present.
9. His chair was by the fireplace.
The appropriate preposition to use here is 'by', indicating the position of the chair in relation to the fireplace.
10. There was an old newspaper on the table.
The correct preposition in this sentence is 'on' as it describes the placement of the newspaper on top of the table.
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