short 
_______ school bag is heavier, yours or mine.
A. Whose B. Who’s C. Who
The city post office is ______ Zhong Shan Road.
A. on B. in C. at
I’m good _____ Maths, but I’m not doing well _____ PE.
A. in, at B. at, in C. at, at
Take bus No.6 and get off ____ the third stop, our school is ____ your left.
A. at,in B. at,on C.on, in
John jumps as _______ as Mike.
A. farther B. far C. farer