During the Spring Festival, the police are ______ the public safety.

A．getting through

B．working out

C．watching over

D．looking into

每年的（）月（）日为固定还款日，包括利息和分期偿还的本金（最后一笔本金和利息于合同到期日偿还）。

A.1；21

B.1；31

C.12；21

D.12；31