Passengers stand and stretch as the train __________ the railway station.
—Send me an email when you are free, will you?—________.
Many students are ________ chatting online, which wastes them plenty of time.
The crowd ________ eastward, believing that they can find gold there.
Jack became seriously ill after ________ in polluted air for many years.
The new secretary is supposed to report to the manager as soon as she ________.