1.About half of the students who enter grade 2 drop out of, or leave, school before grade 12.
drop out of 退学,失学;从……当中退出
She longed to drop out of the race and make an independent life for herself.
她真想脱离这个圈子去过自由的生活。
We won't drop out of the occupation, will we, after the war is over.
战争结束以后,我们不会从这个占领地退出吧?











