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Complete as frases usando as preposições by ou on corretamente.
a- She usually feel good _____a chip, but not ______ an airplane.
b- My mother cancontract us _____telephone, _____fax or _________e-mail.

Assinale a alternativa correspondente. *

on /on/by/by/by

on /on/by/by/on

on /on/by/on/on

on /on/on/by/by