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?