I'm sorry to bother you, ____ can you direct me to the railway station?
---I wonder why Mr Green hasn’t showed up at the meeting yet. ---I’m not sure, but he _______ in a traffic jam driving here.
When I got to the cinema, the film _____ for five minutes.
Mary had promised to give me a ticket for tomorrow. She failed, ____.
—He must be busy doing his homework right now. —I imagine____.
Lu Xun was ___________ medical student before he turned ___________ great writer.