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Exercise, , Change the voice of the following sentences from active to passive., (a) They have bought school uniform., , (b) The doctors have operated upon him., (c) Ali has made peace with his friends., (d) Pratima has visited the doctor. ., , (e) Measles has infected Parul., , (f) | have brought lots of sweets., , (g) She has finished her work., , (h) Mohan has invited Shobha., , (i) They have not prepared the project., , (j) Jughead will have eaten the cake., , (k) Please post the letter., , (l) Work hard., , (m) Never tell a lie.