Lu Xun was ___________ medical student before he turned ___________ great writer.
They must have finished the work by the end of last month, ______?
-I didn’t know you were good friends. -You ______. I have known her since she moved here. You were studying abroad then.
.-Is there any flight to Tokyo today? -I think there ______, for the weather is too bad.
Research findings show we spend about two hours dreaming every night, no matter what we ______ during the day.
-I went to work on foot yesterday, though it ______ cats and dogs. -You ______ by bus. It was likely to get a cold.