Look at this picture

[![enter image description here][1]][1]

When I tell my toddler put the straw into the milk box, she often push it completely into the box. And as a result, the straw got lost inside the box.

What should we express in this situation?

**Please push the straw halfway into the box!** (but sometimes we need to go two-third of the straw not just halfway of the straw in order to reach the milk).

**Please do not push the straw into the box completely!**

  [1]: https://i.sstatic.net/MVDLL.jpg