要掌握一门新语言，你需要投入大量的时间和精力。

To master a new language, you need to ___invest considerable time and effort.

每周花一些时间锻炼身体，为了你的长期健康是明智的。

It's wise to ___invest some time each week in exercise for your long-term health.

当伴侣双方都向彼此投入真挚的情感时，一段牢固的关系就建立起来了。

A strong relationship is built when both partners ___invest genuine emotion in each other.