Here I have a summary of different call backs I've found on the internet. In my own experience, I think they are really useful to call your students' attention. Once they learn the answer, they immediately know what to do (stay in silence, sit down, etc). I normally change them after three weeks or a month. 

Guía que utilicé como exit ticket para una clase de las instituciones y a quién debo acudir en cada caso. Contiene pictogramas en las instrucciones para los estudiantes con NEE. Lo utilicé en primero básico y funcionó muy bien

The following poster contains information in order to call the attention of the audience about the problem that is happening in our planet: too much contamination. This one is focused in recycling in order to save the oceans because there is too much trash in them and it is killing their biodiversity.

The following infographic contains information in order to call the attention of the audience about the problem that is happening in our planet: deforestation. This poster is focused in taking care of the biodiversity and a call for taking action and inform about it.

There are many  activities which allow students to practice and develop many reading-related skills. They are great for developing comprehension which is one of the most important reading skills. Many of the activities also call for higher-order thinking, like inferring or summarizing.
With his resource from Pinterest, students can synthesize the information about stories or even to study chapetrs of novels. 

This is a Power Point in which students will have to quickly recognize if it is a boy or a girl. The idea is to do it as a warming up activity with the whole group, but also you can call random students to say the answers.
At the end, it includes some pointing/circle part.

Complementary ppt to continue working with Boys and Girls vocabulary.

Book "Family and Friends 1" Vocabulary unit 11.

In this Power Point you can find zoo animals vocabulary. Also you will find a game call "Guess the animal". In order to play this game, you need to put the power point on presentation mode, and everytime you click a part of the animal will show on the screen until the animal is complete. The students play to guess which animal is hidden on the picture.

After, you can complement this class with Zoo animals game where you will find a memory game and more animals vocabulary. 

Shouls baseverbought to base verb should is used when we want to express our subjective opinion. In other words: ‘what I think is best for you to do’. EXAMPLES: • You should call your mother more often. • He should apologise before she stops talking to him.

This is another video from https://www.nessy.com/
Now ED introduces Irregular Sue! Ed (time traveler), realizes he has no power on the verbs. They can't travel to the past! So it's time to call Irregular Sue. Sue changes the verbs by using her bubble gun. 
You don't need to use all the verbs you see in video, but I like the way irregular verbs are introduced. 

This is a very fun game that students enjoy a lot. The main objectives of this game are to remember vocabulary and to build trust (because students speak in English and gain confidence) in an enjoyable way.

To play, the teacher gives to some students one of the flashcards and asks one student to start. The student must say its color or shape and call another one. For example:

This activity was an idea given by the English program AMCO. I have played this game with pre kinders, kinders, first graders and second graders. It was always a success.