First, go through the powerpoint and ask students if they can guess the meaning of the idiom. If not, explain it in English and gives examples of how to use it in a sentence.
Then, hand out the worksheet and give students time to fill in the blanks. Then, go through the correct answers together. Have one or two students read the dialogue for each problem.
On the back of the paper, I made them write a sentence or short dialogue for each idiom. This can be challenging for some, so if your students aren't advanced enough, then skip this part. But, if they breeze through the fill in the blank part, they should be able to write their own sentences.