GSS Teacher Guides are available free on the GSS website and they are print enabled (unlike the free review files of the Student Books). We recommend they be printed on looseleaf paper for flexibility in removing or adding sections. The teacher Guides have many additional Investigations or Lab Activities with pages you can copy and provide your students.
The Teacher Guides also explain:
How Can I Customize GSS for My Students?
Various ways of sequencing the Guides in a one year course?