Before you get them to repeat the vocab, get them to just UNDERSTAND it by pointing, e.g. have the flashcards stuck on the walls around the room and they have to point in the right direction when you say the word. Or you say the word and they have to point to the object/part of body (e.g. with objects in your pencil case they could hold up the correct item, or with colours they could point to any item of that colour). I even (very boringly) say the word and they have to point to the right picture in the textbook. Get them to repeat the words with different emotions/loudly/softly/with a high voice/ with a low voice - might be too much with a naughty class. Point to the wrong item on purpose and they have to remain silent (like 'Simon says') or they're out. Or use mime: you say the word, they have to do a mime for it (e.g. adjectives for school subjects: interesting is a smiley interested face, boring is yawning, difficult is scratching your head etc.) Get them to invent the mimes. Make sure the mimes don't involve noise. One of my year 7 Aspergers kids came up with a brilliant mime for easy: squeezing a lemon (easy- peasy lemon squeezy).