A) In China, there might be 10 million teenage internet addicts. (Possibility)
B) It must be hard for him to work and study at the same time. (Obligation)
C) You mustn't park here or you'll receive a fine. (Prohibition)
D) Could you lend me your book for a week? (Request)
E If you're getting fat you should go on a diet. (Advice)
Resposta
GAB: B