1Mysisteristhreeyear的精选

问题详情：用所给词的适当形式填空。 1.Mysisteristhreeyears_________（old）thanI. 2.LessonFiveisnotso_______（difficult）aslessonFour. 3.Whichis________（cheap）,thisoneorthatone? 4.Hesings_______（well）inhisclass....