她对这份工作还不熟悉，感到对自己没有信心。

She was new to the job and felt ___unsure ___of ___herself.

他是一个敏感的人，经常对自己没有信心。

He is a sensitive person who is often ___unsure ___of ___himself.

做演示时，感到对自己没有信心是很常见的。

When giving a presentation, it's common to feel ___unsure ___of ___yourself.