They are all heterogeneous.
If you can identify any difference in the parts, it is heterogeneous. If you wait and parts settle out so that (in the case of a drink), you would want to shake it before drinking, it is heterogeneous.
Tomato juice - though it may be difficult to see, if you look really closely, you could probably identify little pieces of tomato pulp. If you put it through a filter, you would probably have a clearer liquid go through and some solids stopped by the filter.
Seawater - Some sea water is cleaner than other so this one is harder. I have seen sea water with suspended stuff in it so that little things in the H2O can be identified. If you include seaweed and shells, you can clearly tell the difference between the water, the plant and the shells so it is heterogeneous.
Some seawater is really clean and if you can't identify anything in it, it is homogeneous. Salt that is completely dissolved in water is homogeneous.
Homogeneous items are all the same throughout so that no part of it appears to be different from any other part. Examples:
Normal air without something like smoke
Paint that doesn't need to be stirred
Normal vanilla icecream but if it has pieces of something, it is hetero
Soda pop with no fizz
Drinking water (has minerals and some gas dissolved in it)
In fact, anything that is dissolved is a homogeneous mixture.