1. My office, _______ is on the second floor of the building, is very small. A. which B. where C. that D. this 2. The artist _______ painting you bought is a classmate of mine. A. from whose B. from whom C. whom D. whose 3. Geometry is a branch of mathematics _______the properties of lines, curves, shapes, and surfaces. A. concern with B. it is concerned with C. which concern D. that is concerned with 4. Last Saturday I returned to the village _______. A. that I was born there B. in that I was born C. where I was born D. which I was born in it