We can visit you on Saturday or Sunday. Our plans are fairly _____.
A. flexible
B. possible
C. impossible
D. personal
Modern music may have a _____ influence, as well as a positive (积极的) one on teenagers.
A. good
B. poor
C. nice
D. negative
His white hair was in sharp _____ to his dark skin.
A. difference
B. contrast
C. opposite
D. background
丝绸之路上聚落的大小取决于(),而后者的规模取决于可以使用的河流或湖泊的水流量。
A. 驿站
B. 绿洲
C. 军屯
D. 粮仓