如果不小心撞到别人了，你应该说声“对不起”。
If you hit somebody                  , you should say “sorry” to him/her.
当离开教室的时候，记得要随手关灯。
Remember to                   the lights when leaving classroom.
昨天很多学生放弃他们的休息时间去街上做义工。
Many students                   their spare time to do voluntary work in the street yesterday.
他太激动了，不能清楚地表达自己。
He is          excited          express himself clearly.
在一些贫穷的国家，有些病人看不起病。
In some poor countries, some patients can’t                   go to hospital.