Choose the correct variant. I suppose Mary _______ a dentist when she grows up.

{"correct_option"=>"will become", "explanation"=>"The correct answer is 'will become'. This is because the sentence expresses a future supposition about what Mary will be when she grows up. 'Will become' is the correct way to express a future prediction or a supposition in this context. 'Becomes' is the present tense, 'is becoming' is the present continuous tense, and 'is going to become' is another way to express the future but is less natural in this context, making 'will become' the most natural fit."}