Final answer:
In the given sentences, 'gradual' can be changed to 'gradually' and 'sense' can be changed to 'sensitive'. The words 'admire' and 'permit' remain unchanged.
Step-by-step explanation:
The word 'gradual' in the sentence 'The weather was ... changing for the better' can be changed to 'gradually'. The word 'admire' in the sentence 'There was an expression of ... in her eyes' remains unchanged. The word 'sense' in the sentence 'Her skin is very ... to sunshine' can be changed to 'sensitive'. The word 'permit' in the sentence 'You shouldn't take his car without ...' remains unchanged.