there are about fifty-two weeks in a year. and there are s*n days in each week. the first day of a week is sunday. the other days of a week between sundayandsaturdayare monday， tuesday， wednesday thursday and friday. monday is the second day， tuesday is the third day， wednesday is the fourth day， thursday is the fifth day， and friday is the sixth day. what's the last day？ do you know？ __