他的幽默感给这次会议增添了不少轻松的氛围。

His sense of humor ___lends a relaxed atmosphere to the meeting.

他的经验为这个项目增添了可信度。

His experience ___lends credibility to this project.

我朋友经常借钱给我，但总是要求按时归还。

My friend often ___lends me money, but always expects it back on time.

她的微笑给这个严肃的场合增添了一丝温暖。

Her smile ___lends a touch of warmth to this serious occasion.