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1. My sister regretted telling our mother the bad result of her final exam.
My sister wishes . 

2. He wants to lose weight, so he works out in the gym every day.
Because . 

3. He bought such a lot of books that he couldn′t read them all.
So . 

4. It′s a pity I can′t play chess.
I wish . 

5. I regretted not telling him what happened last night.
I wish .