Page 24 Obligation & option answers A. 1. False (you must take your own pencil and eraser) 2. True 3. False (he had to pay the money back) 4. False (they
don’t have to pay any income tax at all) 5. True 6. False (the doctors made him stop smoking) 7. True 8. False
(you can attend the classes if you want to) 9. False (you must wear a crash helmet. We can also use the word
obligatory) 10. True
B. 1. obliged / required 2. no alternative 3. liable for 4. compulsory 5. voluntary 6. mandatory 7. required
8. forced 9. optional 10. exempt
