—Listen! Is Mary singing in the next room?—No. It _______ be Mary.She has gone to Shanghai for an important meeting.
Luckily, no one ________ in the accident.
Many children in Britain ________ to have their own bank cards these days.
_______ free breakfasts ________ in all schools in China?
Please return the book on time after you finish _______ it.
Henry, please call us as soon as you _______ China.