Answer:
1. This is a nice cat. It's much <u><em>nicer</em></u> than my friend's cat.
2. This is a difficult exercise. But the exercise with an asterisk (*) is the <u><em>most difficult</em></u> exercise on the worksheet.
3. In the last holidays I read a good book, but father gave me an even <em><u>better</u></em> one last weekend.
4. Yesterday John told me a funny joke. This joke was the <em><u>funniest</u></em> joke I've ever heard.
5. He has an interesting hobby, but my sister has the <em><u>most interesting</u></em> hobby in the world.
6. Planes can fly (high) <u><em>higher</em></u> than birds.
7. He had an accident last year. Now, he drives (careful) <u><em>more carefully</em></u> than before.
8. Jim can run (fast) <em><u>faster</u></em> than John.
9. Our team played (bad) <u><em>the worst</em></u> of all.
10. He worked (hard) <u><em>harder</em></u> than ever before.
Explanation:
The comparative and superlative degrees of adverbs and adjectives are used to compare between two or more things. The use of either a comparative or superlative degree depends on the number of items/nouns being compared.
The correct comparative and superlative degree forms in the respective sentences are given as below-
1. This is a nice cat. It's much <u><em>nicer</em></u> than my friend's cat.
2. This is a difficult exercise. But the exercise with an asterisk (*) is the <u><em>most difficult</em></u> exercise on the worksheet.
3. In the last holidays I read a good book, but father gave me an even <em><u>better</u></em> one last weekend.
4. Yesterday John told me a funny joke. This joke was the <em><u>funniest</u></em> joke I've ever heard.
5. He has an interesting hobby, but my sister has the <em><u>most interesting</u></em> hobby in the world.
6. Planes can fly (high) <u><em>higher</em></u> than birds.
7. He had an accident last year. Now, he drives (careful) <u><em>more carefully</em></u> than before.
8. Jim can run (fast) <em><u>faster</u></em> than John.
9. Our team played (bad) <u><em>the worst</em></u> of all.
10. He worked (hard) <u><em>harder</em></u> than ever before.