她聘请了一位私人教师来帮助儿子学习数学。

She hired a private ___tutor to help her son with maths.

暑假期间，他们为孩子们请了私人教师。

They hired private ___tutors for their children during the summer holidays.

这所大学为需要额外帮助的学生提供免费的导师辅导项目。

The university offers a free ___tutor program for students who need extra help.