I wonder if he could get it ________ (do) before tomorrow.

Senior members of the staff competed eagerly ________ the position of sales manager in the company.

I know it isn ’t important but I can ’t help ________ about it.

新民主主义社会的主要经济成分包括___________。

著名的罗马圆形大竞技场建于罗马帝国的 ()