Shanghai is the first city in the world ____a high-speed maglev train, from the city to Pudong Airport.
All ___ can be done has been done.
The train __ for five minutes by the time we got there.
It ___ to be raining when we went to see him off at a railway station.
---I left my pen at home. ---___! Use mine.
My father promised that he ___ me a ten-speed bicycle as a present.