1．— What time did you finish your homework yesterday?

— ______ seven o’clock ______ the afternoon．

A．On ; in  B．At ; on  C．At ; in  D．On ; at

2．Japan lies ______ the east of Asia．

A．in    B．on     C．at    D．to

3．It was in 1949 ______ the People’s Republic of China was founded．

A．when   B．that   C．in which D．which