这把折叠椅很轻便。

This folding ___chair is lightweight.

牙医诊疗椅可以调节到各种舒适的姿势。

The dentist ___chair can be adjusted to various comfortable positions.

一把舒适的椅子放在窗边。

A comfortable ___chair sits by the window.

他被任命主持会议并监督讨论。

He was appointed to ___chair the meeting and oversee the discussions.

她被邀请主持下周的学术研讨会。

She was invited to ___chair the academic seminar next week.