总统正在发表演讲。

The ___president is giving a speech.

公司总裁宣布了新的年度计划。

The ___president of the company announced the new annual plan.

会议主席宣布讨论正式开始。

The ___president declared the discussion officially open.

大学校长将在毕业典礼上发表演讲。

The ___president of the university will give a speech at the graduation ceremony.