My grandma lives in the country and I visit her _______ every month. A. / B. in C. at
(安徽)Rick has learned a lot about Chinese culture________he came to China.
Miss Lin________a lot of work for the poor area since 2010.
—________have you been in Chongqing?—For five years.
They dug up the road and________a box hidden under it.
There has never been such a beautiful village________in the world.