I was wondering if i can work in Israel without knowing Hebrew?

There are plenty of people -- particularly in Jerusalem, Tel Aviv and Haifa -- that don't speak Hebrew well or at all (mainly recent Russian or American immigrants). Not speaking *any* is usually a feature of those who never really leave their ethnic community, so you should definitely start picking it up once you're there. But the three languages you do speak are easily the most commonly spoken in Israel after Hebrew and Arabic, so while it might be a little bit tedious at times to communicate with people who don't speak any of your languages (e.g. speaking to bus drivers or ordering food, etc.), you can still get by.