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4.—Mum,can I go to see a movie this afternoon? —No,you can’t.You should 　　　　　(集中) your attention on your exam.  5.We students pay more attention to our environment and all of us are making our best to 　　　　　 (减少) pollution and keep animals and plants 　　　　　　(免受) pollution.The public make 　　　　　　　 (评论) on what we are doing and praise us. 

focus　

reduce

free of/from

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