Here is an ESL warmer.
At the beginning of the lesson write a list of questions related to the things that will come up in that lesson.
Bring in a selection of boxes and ask each group to choose one. Still in their groups, ask your students to choose six of the questions on the board and write them on individual bits of paper and glue one on each side of the box.
Tell your students that they are going to play box bingo. As soon as they have found the answers to all six questions on their box, they shout BINGO and win a prize.
This is a great activity for your students to keep focus during the whole lesson!!!