Hello Nadav
What about sort of reversing the problem?
Instead of highlighting the word in the sentence what about having the sentence as drag-n-drop text as per the quiz question type available on the moodle.org plugins page. The student drags the verbs, nouns, pronouns etc. whatever it is you want them to find, out of the sentence into a table of cells. I think it would be relatively easy to setup. If you make each drag-n-drop part "infinite" then the sentence will be left intact and the student drags a copy of the word required.
So something like this
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Sentence 1 |
Sentence 2 |
Sentence 3 |
Sentence 4 |
Sentence 5 |
Verbs |
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Nouns |
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1 We are the next generation.
2 Congress will be meeting in January
3 A bill must be passed by both houses of Congress and signed by the President.
4 The Commander-in-chief is the President
5 The team quickly huddled on the field.
The students then drag the words into the correct boxes, multiple words can be coded into the boxes.
Just a thought on a way of doing what you want...