1. He failed the oral.
    他口试不及格.

2. Here only oral instruction; there not only that, but textbooks, dictionaries and visual aids.
    一边只是口头讲解；另一边不仅如此，还有教科书、字典和直观教具。

3. Finally, they divided the room in two and gave up on oral communication, communicating primarily through short notes.
    最后她们将房间一分为二，彼此不再讲话，主要通过写便条进行交流。