I put down that I could speak Japanese and Russian even though for Russian, I'm in the same boat as you, sgilani. I can hold a decent conversation in either of these languages but in the case that the interviewer starts speaking the language, I'll answer a few questions and request, in the appropriate language, to switch back to English. I would consider myself fluent in both languages but if the interview breaks down into an interrogation on healthcare policy and ethics, that's where I'm going to run into a problem.