Here’s an activity using one of my favourite resources…

When doing a reading activity, make a note of any words which students mispronounce and write them on the board at the end.  Work through the list, checking pronunciation and drilling the words.  Then give each student a red and a blue card and explain that you are going to say the words.  If you pronounce the word correctly, they hold up the blue card.  If you pronounce it incorrectly, they hold up the red card and you can invite a student to correct your pronunciation.