Present Simple vs. Present continuous

At this moment she _______ to buy a new textbook [want]

wants (Rule: You cannot see it physically so use Present Simple)

The chef _______ the soup right now to check the salt [taste]

is tasting (Rule: You can see the chef physically sipping the soup right now)

The student _______ the correct answer to the question [know]

knows (Rule: You cannot see it physically so use Present Simple)

I _______ exactly what you mean [see]

see (Rule: You cannot see it physically because it means understanding so use Present Simple)

Listen The teacher _______ to a student in the hallway [talk]

is talking (Rule: You can see it physically and it is happening right now)

This specific soup _______ excellent [taste]

tastes (Rule: You cannot see the soup physically doing anything)

Be quiet please I _______ an important email [write]

am writing (Rule: You can see it physically and it is happening right now)

I _______ that this is a very bad idea [think]

think (Rule: You cannot see the physical action of holding an opinion so use Present Simple)

They _______ an apartment in the center of Netanya [own]

own (Rule: You cannot see it physically so use Present Simple)

I _______ dinner with my family right now so I cannot talk [have]

am having (Rule: You can see the physical action of eating right now)

Right now I _______ the grammar rule perfectly [understand]

understand (Rule: You cannot see it physically so use Present Simple)

She _______ a doctor tomorrow morning [see]

is seeing (Rule: You can see her physically sitting and talking with a doctor soon)

Look out the window It _______ heavily outside [rain]

is raining (Rule: You can see it physically and it is happening right now)

She _______ two brothers and one sister [have]

has (Rule: You cannot see it physically so use Present Simple)

They _______ a movie on television at the moment [watch]

are watching (Rule: You can see them physically watching it right now)

He _______ that everything you are saying is true [believe]

believes (Rule: You cannot see it physically so use Present Simple)

Be quiet please because I _______ about my exam [think]

am thinking (Rule: You can see someone physically concentrating right now)

That expensive watch _______ to my grandfather [belong]

belongs (Rule: You cannot see it physically so use Present Simple)