5、haveneverreceivedanyformalkeyboardtraining._____________,theirkeyboardskillsareinefficient.1.He is too young to go to school.He is ___ young ____he can't go to school.3.IhavehadapaininmybackeversinceIfelltwoyearsago.Ifelltwoyearsago._____________Ihavehadapaininmyback.4.Withmyteacher’shelp,Imanage