Final answer:
In the sentences, the correct forms are 'better,' 'most difficult,' 'lesser,' and 'see,' which indicate the comparative and superlative degrees of adjectives when comparing qualities or objects.
Step-by-step explanation:
To complete the sentences using the correct form of the adjective in parentheses, we need to use the comparative and superlative degrees of the adjective as needed. The sentences should read as follows:
- Positive thinking is better than taking revenge.
- When a person begins to think reasonably and widely, she/he will solve the most difficult problem she/he has ever confronted in her/his life with the least sacrifices.
- When you are just between the blue sky and the sea, it is a must to choose the lesser evil.
- I would rather die than see my country ...(the sentence is incomplete, but 'see' is in the correct form).
The use of comparative and superlative adjectives enhances the meaning of sentences by showing a clear comparison between two or more items or degrees of a quality.
In the above exercises, 'better' is the comparative form of 'good,' 'most difficult' is the superlative form comparing the highest degree of difficulty amongst all problems faced, 'lesser' is the comparative form when speaking of two evils to choose the one that is not as bad, and 'see' is the base form of the verb used correctly after the modal 'would rather.'