Ⅰ.用介、副词填空
1．I was very happy ________ the school hours in Britain because school starts around 9 a．m. and ends about 3∶30 p．m..
2．He also told us that the best way to earn respect was to devote ourselves ________ study and achieve high grades.
3．We had to move ________ different classrooms ________ different classes.
