1 . ______ about the student, the teacher called his parents to find out why he was often absent from class.

A．Concerning	B．Be concerned
C．Concerned	D．Was concerned

2 . Although he is far abroad from his hometown, he is much ______ (concern) about his family. (所给词的适当形式填空)

3 . Most teachers are greatly concerned ___ the growth of their students.