Jawaban:

Here are some examples of sentences using "must", "must not", and "have not" in the context of a gas station:

1. Customers must pay before pumping gas.
2. Smoking is not allowed at the gas station, so customers must not smoke while refueling.
3. Employees must wear protective gear when handling gasoline.
4. Customers must not use their cell phones while pumping gas, as this can be a fire hazard.
5. The gas station must have fire extinguishers readily available in case of an emergency.
6. The gas station must not sell gasoline that has expired or is contaminated.
7. Customers have not been allowed to pump their own gas in this state for many years.
8. The gas station have not experienced any fuel shortages recently, so there is plenty of gas available for customers.