选择题。50分
( )1. —_____ does the Expo in Shanghai last ?
— About six months.
A. How often B. How long C. How D. How old
( )2.—____ do you go home to see your parents ?
— Twice a month.
A. How often B. How long C. How far D. How old
( )3.Linda often stays at school, so she___ goes home .
A. hardly B. ever C. hard D. most
