—Why do you call him Mr. Knowledgeable?—Because he knows almost everything we want to know.
---Very few students passed last monthly exams, ______? ---Yes. They all passed because they did good preparations before the exams.
--- Could you tell me ________? --- It’s twenty minutes by underground.
--- What do the police think about the murder? --- I’m not sure. But I want anyone who ______ the clue to contact the police actively.
--- What did he say about his visit to Australia? --- He said he would go there ______.
--- Did you catch the train to Beijing last night? --- No. It ______ for ten minutes by the time I got to the station.