选择方框里所给的be动词填空am is are was were1,【 】you a student?no,l【 】no

选择方框里所给的be动词填空
am is are was were
1,【 】you a student?no,l【 】not 2,【 】he from china no,he【 】not
3,you【 】my good friend 4,Steven and l【 】in the teachers‘ office a moment ago
5,where【 】his football just now 6,l【 】a student some years ago but l【 】a teacher
now 7,the cds【 】on the bookcase yesterday morning