At this time tomorrow we will __________ (fly) over the Atlantic.
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—You have left the light on.—Oh, so I have. I ________ (go) and turn it off.
Selecting a mobile phone for personal use is no easy task because technology ________ (change) so rapidly.
He’ll be an astronaut by the time he ________ (be) thirty.
It ________ (be) long before we know the result of the experiment.