Listen to the audio and complete the sentences with a word or short phrase.
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Mexico City has a shortage of water because it is 1 its resources.
The city sits on a 2 over 2000 m above sea level.
The amount of 3 used by Mexico City to pump water is equivalent to that used by London.
For half a year, heavy rainfall 4 the city.
Isla Urbana is 5 a simple rainwater harvesting system.
The NGO launched its 6 water revolution.
The area chosen as a test site is known as a 7 for migrants.
This system is particularly welcomed because local 8 is in poor shape.
The beauty of this system is that it is essentially 9 free.