( ) My mother works _____ a bank . A. in B. on C. at
What Daming and Sam doing? A. am B. is C. are
Let’s get the bus. A. on B. for C. at
They’re soy milk. A. doing B. drinking C. rowing
We can see lots interesting books A. in B. of C. at
Look the people on the Lake. A. at B. on C. in