Please connect the keyboard        the computer.

A．in               B．at                C．to               D．on

Who's ________ duty today?

[　　]

Japan lies _______ the east of China.

A．in               B．on               C．to               D．at

Guangdong is _________the southeast of China.

A．in               B．on               C．to               D．at

 Please look _____the picture on the wall.
　　   A．in     B．at     C．to     D．on