Complete the sentences using given words:

XI . Complete the sentences using given words:                    
1. If / we / go / school / bus / we / reduce / air pollution.
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2. If / they / have / time / they / spend / their holiday / a farm / next Sunday.
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3. My mother / prepare / food / my birthday party / next week.
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4. Workers / build / more bridges / this area / soon.
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5. They / hope / They / travel / Ha Noi / By air.
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