④Do your homework before you 

　　 time .

　　⑤All the students

　　the classrooms as soon as the bell rings.

　　考点-11. step up

　　【教材原句】their search for a fifteen-year-old boy who went missing three days ago in Dover, New hampshire. (P2)美国警方现已加紧对一名15岁男孩的搜索，该男孩于三天前在新罕布什尔州的多佛市失踪。

　　【例句研读】翻译下列句子中的划线部分，注意step up的确切意义

　　John waited until the teacher had finished speaking to Mary, and then he stepped up.

　　②The factory stepped up the production to meet the increasing demand.

　　③Women’s social position in China has been much stepped up in the past 50 years.

　　④In the near future, the government will step up income tax.

　　⑤When Jack found that he was going to be late, he stepped up his pace.

　　⑥The police have stepped up their search for the lost child.

　　【自主归纳】

　　step forward

　　step back

　　step inside(in)

　　step into…

　　step by step

　　out of step

　　take steps (a step)to do sth.

　　mind/ watch your step

　　keep/ be in step with

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