why there is no open all activity of chapter muhavre?  

Dear Student,

Thanks for trusting our services & letting us know your concern. We've checked with your account and the activities for Muhavre runs flawless at our end. Hence we would request you to kindly switch to Internet Explorer or Mozilla Firefox in case you are using some other browser. Also, clear your cookies, temporary Internet files and history. These are a kind of hindrance in the smooth functioning of your system.

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Namrata Jha
Team Meritnation