1.After school, teacher looked around and asked student to clean up the rubbish before they go. 放学后，老师环顾四周，要求学生在离校前收拾干净垃圾。

2.He looked after his baby brother in last summer. 上个暑假他照顾他的弟弟。

3.She already looked ahead, don’t try to change her mind. 她已经向前看了，别再试图改变她的想法。

4.He looked down on people who offended him. 他瞧不起冒犯他的人。