Part 1
Questions 1–8
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Read the text below and answer question no. 1
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Orcas
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Orcas are the largest (members) of the dolphin family. Centuries ago, they were called ‘whale killers’ by sailors who noticed how (1) ________ they were at hunting large whales. The name of this species later changed to ‘killer whale’, (2) wildlife experts prefer orca.
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Orcas live in family groups called pods. There can be as many as fifty individual orcas in a pod. When young orcas grow up, they (3) in the pod, so some pods contain four (4) of orcas. All the adults help teach the younger ones the essential (5) of underwater life, but the eldest female is in (6) of the group. She (7) decisions about where to go and what to hunt.
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Orcas never rest completely. When they sleep, half their brain stays awake (8) that they can continue swimming and breathing.