C1 Reading and Use of English Part 2

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The team has ..... monitoring the group of whales for several years.

The waters there ..... 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.

So what reason ..... researchers give for the whales returning to the area each year?

After ..... photographed, the whale's tail is uploaded to the database.