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Exercise "IN, ON, AT or TO?", created by webmaster (a free exercise to learn English):
Results of the 428 242 people who have taken this test:
Average mark: 78.5 / 100 Share
Latest member with a 100/100 (perfect mark): stupefaite / POLAND, on Wednesday 28 June - 18:30:
"Good job"
They got a perfect mark
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