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?