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21. He used (do) research in this library.
22. My mother used this knife (cut) an orange.
23. This farmer is used to (cut) grass with a knife.
24. Is your father used to (drive) a tractor?
25. She used a pencil (write) this letter.
26. Is this wood pulp used to (make) paper?
27. I'm getting used to (stay) up late.
28. It takes me twenty minutes (get) to school by bike every day.
29. He spend two hours a day (play) soccer with his friend.