Answer:
Ans 1. Her chocolate cake is amazing even it has no butter in it.
Ans 2. I would like to walk to work even though it is raining.
Ans 3. I like to walk to work even if it is raining.
Ans 4. Even if he doesn't say so, he loves you.
Ans 5. Even though he doesn't say so, he loves you.
Explanation:
.We use even when we want to express a surprising extreme or when we want to say that something is more than we expect.
.We use even though when we’re talking about a real situation.
.We use even if when we’re talking about an unreal situation