I have always found having a bell work assignment projected on the screen as students enter class to be an easy routine.  Students sit down and get started on something that is suuuuuuper easy for them to do, and will remind them of what we previously did or get them ready for that day's lesson. ...

This post should be called "How to structure your 50-minute Spanish class period so students listen, speak, read, and write Spanish every day", but that's way too long. 🙃 It's definitely not possible for students to do a listening activity AND a speaking activity AND a reading activity AND a writing activity absolutely every single day....