Ask the first student a question (usually very easy) and if they get it right then move on to the second student in the group and ask if they would like to continue or 'bank' the $500, the questions I use slowly get harder but in general they are relatively easy (it's more fun that way, plus they're 50/50 so they always have a chance).
This activity is a great one for pair work. Present Perfect is the best to be practiced on activity work sheets like this. Enjoy. I do practice them in my class. Students work individually at first, then they turn to their partner and work with him.
A productive link which contains high Intermediate English Audio Lessons for busy people, aiming to help them to
*Improve English listening skills
*Learn to speak and understand fast English
*Develop natural English conversation skills
*Learn to use English phrasal verbs and idioms
*Formal, informal and general English styles
*Complex sentences, clauses, questions and grammar
*Learn to tell stories and make friends in English
Students should put the words in order to make correct questions.This activity will reinforce the learners ability to make correct sentences. This is very interactive and helpful activity.