1. Tom made _____great progress last semester and as _____ result he was praised by the teacher.
A. a; a B. a; / C. /;a D. /; /
2. It is well-known to us all that knowledge is ___treasure, but practice is ____key to it.
A. a; / B. a; the C. the; the D. /; the
3. ----Excuse me. I want to have a letter mailed, but I can’t find a post office.
----I know ____ nearby. Come on, I’ll show you.
A. it B. one C. that D. another
