The student will give us a talk__how to use our spare time.填什么为什么?
问题描述：
The student will give us a talk__how to use our spare time.填什么为什么?
答
that ，定语从句
答
The student will give us a talk__how to use our spare time.
填on 或者 about
语法：a talk_on_how to use our spare time.关于度过业余时间的谈话