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Choose a summary word from the list to complete the following five sentences.process;situation;finding;estimation;problem;difficulty;disruption;view

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Our pilot study has shown that wind turbines used to generate electricity can pose a threat to flying birds. This () suggests a need for further research on improving the safety of these mechanisms.

The traditional economic and consumer behaviour models assume a rational, thoughtful consumer who gathers information about a good and then carefully makes a purchase. This () has recently been challenged, particularly because of the growing number of consumer choices.

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