Unit 12.2
Revisión Topics 7-11
Advertising
Página dejada intencionalmente en blanco.
Exercises
The exercises are not created yet. If you would like to get involve with their creation, be a contributor.
Ambassadors
Open TextBooks are collaborative projects, with people from all over the world bringing their skills and interests to join in the compilation and dissemination of knowledge to everyone and everywhere.
Become an Ambassador and write your textbooks.
Online Teaching
Become a Books4Languages Online tutor & teacher.
More information here about how to be a tutor.