A．paid no attention to their teachers in class
B．contradicted their teachers much too often
C．could not cope with their studies at school successfully
D．behaved arrogantly and stubbornly in the presence of their teachers

A．their nonconformity brought them a lot of trouble
B．they were seldom praised by their teachers
C．school courses failed to inspire or motivate them
D．teachers were usually far stricter than their parents

A．less to parental help and their education at home
B．less to school instruction and training
C．more to their parents' encouragement than to school training
D．less to their systematic education than to their talent