Mark suddnly had a bad bllyach bfor class bgan this morning. His classmats immdiatly snt him to th Popls Hospital narby. In th hospital, th doctor gav him a mdical chck-up. Th rsult of th xamination showd that h was suffring from acut appndicitis and h ndd an opration right away. Th monitor of his class quickly calld Marks fathr and askd him to com to th hospital at onc. Aftr a whil,Marks fathr cam and th opration bgan in no tim. Svral days latr,Mark rcovrd.