A. about B. on C. in D. at
A. 对 B. 错
A. exhaust B. use C. exhausting D. using
A. scale B. relative C. extent D. small
A. ecology B. ecologying C. ecologyed D. ecologied
A. nuisance B. nuisancing C. nuisanced D. nuisancion
A. off B. on C. in D. at