他轻轻地用铅笔敲着桌子，思考着问题。

He was ___tapping the desk lightly with his pencil while thinking.

医生正在给病人胸腔穿刺抽液。

The doctor is ___tapping fluid from the patient's chest cavity.

公司决定任命他为新项目负责人。

The company is ___tapping him as the new project leader.

这家初创公司正在利用社交媒体来拓展客户群。

The startup is ___tapping social media to expand its customer base.