What do these words mean: watch, look, see?

[Stupy]

English Language Tests, Intermediate level

ESL/EFL Test #831 "Look, See and Watch (2)", question 9

You'd better follow the rules now. The principal is ......... you and you could get expelled if you get into trouble one more time.

(a) looking
(b) seeing
(c) seen
(d) watching

English Language Tests, Intermediate level

ESL/EFL Test #831 "Look, See and Watch (2)", answer 9

You'd better follow the rules now. The principal is watching you and you could get expelled if you get into trouble one more time.

Correct answer: (d) watching
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i am very apologize to you because i do not understand with watch, look, see.
could you explaint the way to use for me ?
how many ways do i observe them?

[Linda]

look: to pay attention to something; it seems
see: to understand; a visual image you see with your eyes
watch: to look at something for a period of time; to monitor something
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