我的小弟弟是我做作业时的好帮手。

My little brother is a great ___helper when I do my homework.

我们请了一位帮手来打扫房子和照顾孩子。

We hired a ___helper to clean the house and look after the kids.

这个计算器是解决数学问题的好帮手。

This calculator is a great ___helper for solving math problems.