我的兄弟，只有17岁，已经通过了驾驶考试。

My brother, ___who's only 17, has already passed his driving test.

坏人试图接管世界，而好人，也就是英雄们，试图阻止他们这样做。

The bad guys try to take over the world and the good guys, ___who are the heroes, try to stop them from doing so.

我的老师，非常善良，总是帮助我们做作业。

My teacher, ___who is very kind, always helps us with our homework.