We don’t permit________in our school.Would you please put your cigarette out?—Forgive me.I didn’t know.[ ]

下列各句中，没有语病的一句是

So you missed the English class thismorning—______ I arrived 20 minutes after itstarted

______comfortably in his chair,my father enjoyed music with his eyes half _______[ ]

The World Health Organization expects a vaccine(疫苗)against H1N1 to be by September or October this year.