School was over. Usually David's mother would take him home from school but today she was not here. David decided to go home alone foot, and it took him about half hour. When he got home, he couldn't get in he did not bring his keys. He knocked on the door, but no one answered. David thought his mother (be) in the toilet, so he waited patiently for her. After a few (minute), David knocked again, but still no one answered. "What is happening? Is there anything wrong with my mother?" he thought to (he) and got worried. Just at that moment, he heard the (friend) voice of his neighbour, John. David told him that no one was at home, and John asked him (stay) in his house. Two hours later, when David's mother got back, he (play) games with John. happy he was to see his mother！
If you usually take the school bus or sometimes need to take public buses to school, there are some important rules you should know.
●When you are waiting for the bus, you should wait at the bus stop, and stand well back.
●When you get off the bus, make sure you and the driver can see each other, and wait for the driver to signal to you before you cross the road in front of the bus.
●Never go back for anything you may leave on the bus when it is starting.
●Never bend down(蹲下) near the bus when you walk to or from the bus stop.
●You should cross the street at a crosswalk or a street corner, and wait for the light to turn green or for the WALK crossing signal.
●It is important to look carefully to the left, the right and the left again when you cross the street.
●Remember that it is dangerous to stay in the areas around buses where the driver can't see you. Don't run between parked cars or buses.
●Do not run across the street or through parking areas to catch up with your friends.
