1. the drink has lost its fizz BUT We are more likely to say, "The drink has gone flat."
2. I can see it(OMIT) in your eyes that you're sad.
3.My kitchen has more width than your room.
When we measure a room, we say, "It measures 15' long by 10' wide", so... Colloquially, we actually do talk about a room being wider, longer, deeper than... My kit