9. I'm sorry, but you __ eat in class. a) could b) don't have to c) mustn't
10. The fish in the aquarium are __ every morning. a) feed b) feeding

9. The correct answer is c) mustn't.

I'm sorry, but you mustn't eat in class. It means eating in class is not allowed.

10. The sentence needs a passive form: The fish in the aquarium are fed every morning.

The correct word should be fed. It is not in the given options, because feed and feeding do not fit here.

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