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- Great changes _________ in Tongren in the past five years.
- Great changes ______ in the city and a lot of buildings ______.
- Peter, do you know who _______ my dictionary?- Sorry, I don’t know. I _______ it.
- ________ have you taken a plane?—Twice.[ ]
- Great changes have taken place since then in the primary school _______I am studying.