His uncle went abroad in 2010, and _______since.
Mostofthemistakes____becauseofcarelessness.
Theboysittingbythewindowistheonlyoneofthestudentswho _______fromthecountrysideinourschool.
Thestudentsinourschooleach_________anEnglishdictionary.
Thepairofshoes__________wornout.
Aprofessorandawriter_________presentatthemeeting.