CAE Reading & UoE part 2
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The team has ________ monitoring the group of whales for several years.
The team has been monitoring the group of whales for several years.
The waters there ________ believed to be where female whales give birth to their young.
The waters there are believed to be where female whales give birth to their young.
The extent to which the whales' habits ________ been altered by human activity is unclear.
The extent to which the whales' habits have been altered by human activity is unclear.
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