Here are the completed sentences:
1. When in the car, don’t **lean** out of the window.
2. When on the bus, don’t **talk** to the driver.
3. When you enter the bus, don’t **push** others.
4. When you ride your bike, **wear** a bicycle helmet.
5. When on the street, **look** both ways before crossing.
6. When on the bus, don’t **wave** out of the window.
7. When going to school, **walk** on the pavement.