Choose the correct words to complete the sentences. 1 In a park, you must/mustn't walk on the grass. 2 On a bus, you must/mustn't talk to the driver. 3 In a library, students may/mustn't borrow up to six books. 4 In an exam, students must/mustn't answer all the questions. 5 To drive a car, students may/must have a licence. 6 In a hotel, guests may/must use the pool between 4 p.m. and 10 p.m.

1. mustn't (It is generally not allowed to walk on the grass in a park.)

2. mustn't (It's important for safety and politeness to not talk to the driver on a bus.)

3. may not/must not (Libraries usually have rules about borrowing, and 'may not' or 'must not' fits the context of permission being denied or a rule being enforced.)

4. must (In an exam, it is a requirement to answer all questions.)

5. must (Driving a car requires a licence, so it's a necessity.)

6. may (Guests have permission to use the pool during specified hours.)