help giúp mình với Tranformation 6. They haven’t finished their homework yet. - Their homework ______________________________________________________ 7. Nobody could solve this mathematical problem. - This ________________________________________________________________ 8. Throwing rubbish pollutes the environment. - The environment ______________________________________________________ 9. Elias Howe invented the sewing machine in 1895. - The sewing machine ___________________________________________________ 10People spend a lot of money on advertising every year. - A lot of money _______________________________________________________

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