Exercise 12 - Part 2
For questions 1-8, think of the best word that fits each gap. Use only one word in each gap. All answers must be in lowercase.
Some of the gaps might have more than 1 answer, in that case, the system will detect it as incorrect, but will provide all the possible answers.
Every year, millions of birds travel thousands of miles between their breeding grounds and their winter homes. Scientists have (1) studying this phenomenon for decades, yet many questions remain unanswered. How (2) these creatures manage to find their way across vast oceans with such precision? It is thought that they rely (3) a variety of cues, including the position of the sun and the Earth's magnetic field. (4) addition, some species use landmarks like mountains or rivers to guide them. Migration is (5) without its risks, as birds must face storms and predators (6) the way. Nevertheless, (7) as the journey may be, it is essential for their survival. Without this seasonal movement, many species would (8) unable to find enough food during the winter months.
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