Answer the questions.

1. If a fee or charge is mandatory, do you have to pay it or can you choose? You have to pay it.
2. If an event is inevitable, how certain is it that it will happen? 20%, 50% or 100%? 
3. If a car is exempt from tax, how much tax do you have to pay for it? 
4. If an exam is optional, are you obliged to take it? 
5. If you are liable for something, is it your or someone else’s responsibility?