【1.Heisoneoftheboyswhoalways_do_wellatschool.2.Heistheonlyoneofuswho_has_passedtheexam.3.Eitheryouoroneofyoursyudents_is_toattendthemeeting.4.Atpresent,oneoftheargumentsinfavorofthenewairport_is_thatitwi】

　　1.Heisoneoftheboyswhoalways_do_wellatschool.

　　2.Heistheonlyoneofuswho_has_passedtheexam.

　　3.Eitheryouoroneofyoursyudents_is_toattendthemeeting.

　　4.Atpresent,oneoftheargumentsinfavorofthenewairport_is_thatitwillbringalotofjobstothearea.

　　5.Everystudentaswellasteacherswhoaretovisitthemuseum_is_askedtobeatthecshoolgateontime.

　　分别解释一下横线上为什么填这个（主要是为什么谓语动词填单数或复数）,