用所给词的适当形式填空。

1. I can finish ______ (read) the book before five o’clock.

2. I ______ (leave) school at 4: 30 in the afternoon.

3. We have two ______ (lesson) in the afternoon.

4. Lucy and her sister ______ (like) art very much.

5. We ______ (not go) to school on Sundays.

关于恶性骨肿瘤描述正确的有（）

A.生长快，常侵及邻近组织

B.可发生肺部或骨转移

C.骨皮质或髓腔有破坏缺损区

D.与正常组织无明显界限，边界不清

E.骨膜常受累，呈葱皮状、针样、放射状、三角形