Xiao Ming and his parents went out for a long-distance bus trip during the National Day holiday. Xiao Ming saw that the distance between the car in front and him was the same, and the truck behind him

Xiao Ming and his parents went out for a long-distance bus trip during the National Day holiday. Xiao Ming saw that the distance between the car in front and him was the same, and the truck behind him was getting closer and closer to him. Taking the long-distance bus as a reference, the position between the bus and the long-distance bus has not changed, so the bus is stationary;

If Xiao Ming or a long-distance bus is taken as a reference, the truck behind him is getting farther and farther away from him, indicating that the position has changed, so the truck is moving;

Passengers say "Guangzhou is coming to see me" and choose a moving train or yourself as a reference.

So the answer is: still; Exercise; Train.