The newspaper says if more underground lines          next year, it will be much easier for people to travel around Nanjing.

—Why was he late for school yesterday?— He overslept. By the time he got to the bus stop, the bus ________ already ______.

Robots ________ heavy work on farms in the future.

Many accidents _________ by careless drivers last year .

 _______a sports meeting on the  playground next week  .