if you want to see a doctor ,you fix a date with him ahead o

if you want to see a doctor ,you fix a date with him ahead of time.That is a common __in the USA
A sense
B practice
Crule
Dreality (B)
2.Mr Wang asked for___,for his father was badly wounded.
A a two-month's leave
B a two-months' leave
C two-month's leave
D a two months' leave (D)这种我搞不懂~
3.I was looking through the evening paper when __interested me.
A an important information
B important information
C the important information
D a piece of important informations (B)我选C?

common sense是常识的意思common practice是惯例的意思CD就没有这种说法,与医生预约后看病在US是惯例.1.选B（相信听完我的解释后你会反驳用“常识”在汉语意思中也讲的通,那我想建议你查阅一下高阶中这两个短语的英文解释,汉语解释时他们细小的差别有时体会不到……）
一个两个月的假期a two-month leave= a two months' leave （two-month 和two months' 是adj）2.选D
至于第3题,考察冠词用法,有很多讲究一时半会说不完,就本题而言简单地说,如果 information的具体内容在文中出现后再次引用时要加the,但本题没有,3.选B