听力音频：
Part 4 Questions 31–40
Complete the sentences below.
Write ONE WORD ONLY for each answer.
Treadle Pump
Background
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The pump was designed for farmers in India
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In the dry season, many people move to 31 ______ for paid jobs
Description
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Like an exercise bike made up of two treadles
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Metal pump cylinders are linked to a pond or well by a plastic 32 ______
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Farmers use pumps in the 33 ______ period
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In 2006, a new version was developed to be used by the 34 ______
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To prevent blockages, the design was improved by attaching a bamboo 35 ______
Benefits
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Economically, many farmers have increased their 36 ______
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For health, pumps users have a better 37 ______
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Environmentally, the pump is less dependent on 36 ______ fuel
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For sustainability, the device is easy to 39 ______ and maintain
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Mechanics need a short period of time for 40 ______
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