1. A. discover B. improve C. operate D. install
2. A. convenience B. inconvenience C. convenient D. conveniently
3. A. ways B. systems C. spaces D. means
4. A. around B. over C. by D. ahead
5. A. occasionally B. gradually C. regularly D. eventually
6. A. on B. at C. in D. with
7. A. pressed B. launched C. produced D. announced
8. A. ability B. position C. consistency D. capacity
9. A. which B. what C. whose D. where
10. A. man-made B. picturesque C. efficient D. breathtaking