choose the word whose stress pattern is different :2 syllables
1.A.number B.ago C.children D.classmate
2.A.student B.teacher C.engineer D.worker
3.A.classroom B.pencil C.eraser D.ruler
4.Adoctor B.driver C.thirty D.nineteen
5.A.pencil B.twenty C.window D.eraser
6.A.engineer B.mother C.father D.sister
7.A.doctor B.teacher C.student D.police
8.Acountry B.city C.routine D.classroom
9.A.bookshelf B.hello C.pencil D.window
10.A.number B.sixteen C.eleven D.eighteen