1. Lack of sleep can ____ all sorts of mental and physical health problems. 2. Her refusal to pay the fine ____ a short jail sentence. 3. Around the world, ____ is having a serious impact on the survival of many species such as frogs. 4. Mountain gorillas are amongst the most endangered ____ with only a few hundred individuals left in the wild. 5. In Quibdó, Columbia, there is no dry season and it ____ for 304 days a year on average. 6. Scientists agree that the burning of coal could ____ global heating.

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