most children stay at home until they ()school age

问题描述:

most children stay at home until they ()school age
get come reach arrive应该选哪个?
do you go (back on;on with;in for; through with)sports?应该选哪个?

reach 达到
达到上学的年龄第二个呢?go in for 对什么什么感兴趣第二个的其他的短语是什么意思呢?go back on背弃,违约
go on with 继续做某事
go through with完成,把...进行到底