7 You aren't wearing a coat. You ..... be really cold!

Analysis:

The sentence expresses a strong assumption or probability about someone feeling cold because they are not wearing a coat. The modal verb 'must' is used to express this certainty or strong likelihood.

Breakdown:

• A can: Incorrect. 'Can' indicates ability or possibility, not strong probability.
• B must: Correct. 'Must' is used for strong deduction or probability.
• C may: Incorrect. 'May' indicates a weaker possibility.

Translated Question:

7 Ты не носишь пальто. Тебе наверняка очень холодно!