Question

You
disturb him during his
work! (Prohibition) *
O could not
O must not
O
might not
Whose book is this? - I am not sure.
It be Ann's. (Possibility) *
O
might
O may
O must
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Answer 1

Must not
May
Espero ter ajudado

Answer 2

Resposta:

you must not disturb his work

it may be Ann's