Question

Task 3 Choose the correct option 1. Usually at university you mustn't / don't have to go to classes all day. don't have. 2. You mustn't / shouldn't take your own food into a restaurant.​

Answer 1

1. Usually at university you don't have to go to classes all day. (как правило, но бывают исключения)
2. You mustn't take your own food into a restaurant. (строгое правило)
как-то так

Answer 2

1. Don’t have to
2. Mustn’t