21. The old paper mill has been ________ to make way for a new shopping centre.
A) held down B) kept down C) cut down D) turn down
22. It may be necessary to stop ________ in the learning process and go back to the difficult points in the lessons.
A) at a distance B) at intervals C) at case D) at length
23. You can hire a bicycle in many places. Usually you‘ll have to pay a ________.
A) deposit B) deal C) fare D) fond
24. My grandfather had always taken a ________ interest in my work， and I had an equal admiration for the stories of his time.
A) splendid B) weighty C) vague D) keen
25. ________ quantities of water are being used nowadays with the rapid development of industry and agriculture.
A) Excessive B) Extensive C) Extreme D) Exclusive
答案：DBADA
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