1.When we get back, I might sign up for the breeding program.我们回去的时候我没准可以报名参加那个繁殖计划

2.Since you are a psychology major, you should sign up for it.既然你是心理学专业的，就应该学一下。

Schools or teachers who sign up for the National Math Club receive a kit full of activities and resources, but there's no special teacher training and no competition attached.

报名参加囯家数学俱乐部的学校或教师会收到一整套活动方案和学习资源，但没有专门的教师培训，也没有相应的比赛。