You leave the supermarket and go straight to Heathrow to meet an old friend of y...

Questão de Inglês da banca FUMARC aplicada no concurso BDMG (2011). Confira a resolução completa abaixo:

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You leave the supermarket and go straight to Heathrow to meet an old friend of yours. But at the entrance, you find the above sign which means you _____ enter.