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Exercise "Birds' migration", created by bribri83 (a free exercise to learn English):
Results of the 326 people who have taken this test:
Average mark: 82 / 100 Share
Latest member with a 100/100 (perfect mark): santiago2011 / FRANCE, on Wednesday 05 September - 15:44:
They got a perfect mark
Stats (325 candidates)
Question 1 passed: 86.5 %
Bird * fascinates humans.
Question 2 passed: 81.2 %
The cuckoo from Kamchatka lives in * Russia.
Question 3 passed: 82.5 %
It flies some * kilometres.
Question 4 passed: 76.6 %
How the birds are able to navigate so * is a puzzle.
Question 5 passed: 80.9 %
Some land right on the same * as they did the previous winter.
Question 6 passed: 83.4 %
In birds stations, they are * to get to the bottom of the navigation mystery.
Question 7 passed: 81.8 %
Migratory birds follow an inner *.
Question 8 passed: 80.3 %
They take their bearings from * separate processes.
Question 9 passed: 77.8 %
They likely also gauge space by the magnetic field and their sense of *.
Question 10 passed: 90.2 %
How birds sensory perception of magnetic fields works is still an * question.
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