网址：http://m.1010jiajiao.com/timu_id_810129[举报]
South Korea is ___ the east of China.
A．in
B．to
C．on
D．at
Teachers' Day is________ September 10.
[ ]
We usually have a class meeting ________ Monday afternoon.
A．at B．in C．on D．to
The snake lives ________ grassland.
A．on
B．in
C．at
D．to