The meaning of the word is various ______ different situation.

A．depends on

B．depending

C．depending on

D．depended on

易恶变的肿瘤为（）。

A.化牙骨质纤维瘤

B.纤维骨瘤

C.骨化纤维瘤

D.牙骨质母细胞瘤

E.骨纤维结构不良