—Listen! Is that Millie singing?—No. It _____ be Millie. She has gone to Beijing.
---Would you mind my opening the window?---________________.
This morning Jack came to school _________ than _________ student in his class.
Peter drives __________ Amy, so it will take Peter _______time to get to the hotel.
---Mark speaks English well, but you ______________ him.---Thank you.
---_________ does he take this medicine?---Twice a day.