单项选择题
A．They are encouraged to do maintenance for the training centre. B．Most of them get paid for their work. C．They have to cook their own meals. D．They can choose to do community work.
A．He didn’t get the book he needed. B．He had no idea where the book was. C．The library is closed on weekends. D．He was not allowed to check out the book.
A．She thought there were no tickets left for the show. B．She thought the seats on the left side were fully occupied. C．The show was planned a long time ago. D．The audience were deeply impressed by the show.