根据对话内容用合适单词填空

A: Who is   1      2   today?

B:   3    am.

A:   4   we all here?

B: No.

A:    5   isn't at school today?

B: Zhang Qiang.

A:   6    is he?

B: I   7    know. But I think he's

  8     9   . He looks    10    his father.

A: I see.

疏散楼梯间及其前室的门净宽不应小于0.9m。( )