In this task, you need to count the occurrences of the given word in the given sentence.

Sentence: 'two adults on skis with a child on skis between them'. Count the occurrences of the word 'on' in the given sentence.
2

Sentence: 'a plate filled with various food items and a carton of milk'. Count the occurrences of the word 'a' in the given sentence.
2

Sentence: 'a close up of a cat laying on a laptop on a chair'. Count the occurrences of the word 'a' in the given sentence.

4