单项选择题
There is not much time left for you to cover everything, you'd better ______ unimportant points.（）
A. leave off B. focus on C. leave out D. concentrate on
单项选择题 The weather being unfavorable, they had to ______ the sports meet.（）
单项选择题 Everything depends on ______ we get a raise in our salary.（）
单项选择题 If law and order （） not preserved, people will not be able to live a secure life.
