51. If you study harder, you (get)_______________________ good marks in the coming examination.
52. “Harry Potter” is the most interesting film I (ever/ see)_______________________.
53. It (take)_______________________ him 2 hours every day to practice speaking English when he was a student.
54. We are all looking forward to (meet)_______________________ you.
55. Hoang Sa island district (establish)_______________________ in January, 1997.
56. Air, water and soil (be)_______________________ necessary to all living things.
57. Polluted water (kill)_______________________ fish and other marine life.
58. Robots (enter)_______________________ every day lives a long time ago.
59. In medicine, robots (use)_______________________ to replace limbs and other parts of the body.
60. Pollution (cause)_______________________ damage to air, soil and water.
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