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Here are the correct answers for the grammar revisions: 7. B. Peter asked me whether I would go to the festival with him. 8. C. My father asked me where I was going. 9. B. Oliver asked me what I would do if I had a day off. For Unit 7's B, C and D, and Unit 7's 10, here are the answers: B. The doctor told me I would suffer from diabetes if I didn't reduce sugar in my daily meals. 10. B. My brother asked me how to open that box. Here are the corrections: 1. No mistake. (My mother asked me if I could help her do gardening tomorrow.) 2. Jim wondered whether to buy a new radio or fix his old one. (Change "if" to "whether" to indicate a choice between two options.) 3. Peter asked me if I was free that weekend. (Change "was" to "if I was" to form a question.) 4. I wanted to know who the winner of that competition was. (Change "who was" to "who the winner... was" to form a question.) 5. They said that Peter can't make it to the final show. (Change to "They said Peter couldn't make it to the final show" or keep it as reported speech: They said that Peter couldn't make it to the final show.) 6. My manager asked if I had finished my work yet. (Change "have" to "had" to indicate the past perfect tense.) 7. Peter said that he was going to get married the following month. (Change "following" to "the following" to indicate a specific time.) 8. She asked me what I had done the previous day. (Change "had I" to "I had" to form a question.) 9. Now I just don't know whether to leave or stay. (Change "stayed" to "stay" to maintain parallel verb forms.) 10. Mr. Brown said that he would get a promotion by the end of this year. (Add "a" before "promotion" to make the sentence grammatically correct.)