We'll leave for Nanjing ______ next month.

[    ]

　　A. the   B. a   C. /   D. an

______ Summer Palace is one of the parks in ______ Beijing.

[    ]

　　A. The, /   B. /, the   C. The, the   D. /, /

-- What does your mother do?

-- She's ______ teacher.

[    ]

　　A. the   B. a   C. an   D. /

Beijing is ______ capital (首都) of China.

[    ]

　　A. the    B. a    C. an    D. /

He sang and played ______ piano at the concert.

[    ]

　　A. the   B. a   C. an   D. /