Correct a mistake

Giúp với ạ !
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IV. Correct a mistake
1. She wishes there is enough food for everyone in the world.
2. Carson is very depressing as his closest friend is moving to another town soon.
3. Nick told Jesica if she had gone to Nancy's birthday party the previous night.
4. Of the two sisters, Marie is the most intelligent and she does well at school
5. I am confident that life in the country has improved significant in the last five years.
6. We wish we can consult an expert on how to solve this problem.
7. The environmentalist suggested to plant more trees to improve the city's landscape and the environment as well.
8. He worked much more hard for his exams than he did for his everyday school work.