Explaining the task before you start
"Don't write anything the first time you listen"
"You don't need to write full sentences, just take notes"
"Put the sentences/ paragraphs/ photos in order"
"We'll do the first question together, then I'll play the rest through without stopping"
"I won't stop the tape, but we will hear it two or three times"
"The questions are in the same order as the text"
"It's a real (IELTS/ TOEIC/ etc) exam task, so it will play once/ twice, with a pause (between and) at the end"
"Listen and colour in the clothes with the colour that is says on the tape"
"Listen and draw a line between the person and his or her favourite food"
"You'll need to change some of the words from the listening to make sure they fit in the gaps (grammatically)"
Read more at
http://www.usingenglish.com/articles/classroom-language-when-doing-listenings.html#75xgmDu6XLpP1lAK.99