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用所给的适当形式填空。 1. Students must study hard_______ (make) more pro- gress. 2. Tennis_______ (invent)a hundred years ago. 3. John told me that he_______ (fly) to Japan next Wednesday. 4.—How long_______ your mother_______ (teach) English in this school? —For ten years. 5. The house_______ (surround) by a small garden.