China Railway is testing a new service. For the first time, passengers can travel together with their pets along the Beijing-Shanghai high-speed railway.

The new service ____1____ a rule of “leaving at the same time and arriving at the same time”. It makes sure that pets and their owners travel on the same train.

The service is being tested on 10 trains now. Pet ____2____ must buy the tickets online. It must be at least two days ____3____ the trip and then they may take one healthy, family-trained cat or dog each person. The pet must weigh no more than 15kg and ____4____ no taller than 40cm at the shoulder.

This is ____5____ news for pet lovers in China. If the test works well, more trains may allow pets in the future.