comparative/ a gradable adjective

A wonderful morning! ^^

    Thank you for answering your homework! ^^ I\'m so glad that you  got a perfect score here! Hurray!!! ^^ With that, I\'m going to give you three cute smiley[s]. I hope you\'ll get a perfect score on your next homework. Tap your shoulder and say, \"Good job!\" ^^ Have a great Monday ! ^^ Happy New year:)

T. Nina^^

 1. This is __the most expensive______ book in the whole store.
more expensive
the most expensive
>>Correct!
2. That shirt is __dirtier______ than the other one.
dirtier
the most dirty
>>Correct!
3. Peter was laughing hard, but his wife was laughing even __harder______!
the hardest
harder
>>Correct!
4. He is __the strongest______ man that I know.
stronger
the strongest
>>Correct!
5. Robert is never on time. He always arrives __later______ than the rest of us.
later
the latest
>>Correct!
6. That is _the best_______ song I\'ve ever heard!
better
the best
>>Correct!
7. Your cat is __smaller______ than ours.
smaller
the smallest
>>Correct!
8. I thought this test would be difficult, but it\'s __the easiest______ test I\'ve ever taken.
the easiest
easier
>> Correct!
9. Out of all the films I\'ve seen, this one is __the saddest______.
sadder
the saddest
>>Correct!
10. Your answer is wrong, but it\'s __more correct______ than the other students\' answers.
the most correct
more correct