Giải phương trình x^3 - 8x^2 + 21x - 18=0

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Mọi người làm giúp mình bài test này với ạ ! I.Vocabulary and grammar Choose the best answer A,B,C or D to complete each of the following sentences 1. We decided not to play soccer ........... we were too tired A.But B.Because C.So D.And 2. This dress is beautiful but i can't wear it beautiful I have ........................... a lot of weight A.Put out B.Put into C.Put on D.Put in 3. We can reduce the amount of electricity by replacing ordinary light bulbs with .................. bulbs A.Money-saved B.Energy-saved C.Money-saving D.Energy-saving 4. If we ................. trash onto the water , we will keep the water clean A.Throw B.Don't throw C.Did't throw D.Won't throw 5.He drives his car very ................ A.Care B.Careful C.Careless D.Carefully 6.My younger brother is afraid of ..................... homework at weekend A.To do B.Doing C.Do D.Being done 7. She is going to .................... their children when they are at work A.Look for B.Look at C.Look up D.Look after 8. Remember to .................. the light before going out A.Turn on B.Turn in C.Turn off D.Turn out 9. Choose the word that has different stress from the others A.Interest B.Inform C.Necessary D.Dangerous 10. At the end of the winter , the price of winter clothes in the shops usually ............. A.Drops B.Lowers C.Skins D.Reduces 11.Let's ............... out to eat tonight A.Go B.To go C.Going D.Went 12.If you want save money , you should ............. the amount of water your family uses A.Increase B.Repair C.Reduce D.Accept 13.I'm really ......... that people have spoiled the environment by littering garbage everywhere . A.Disappoint B.Disappointed C.Disappointment D.Disappointing 14. William suggested ........................ at home for a change A.To stay B.Stay C.Staying D.Stayed 15. ...................................... it was so cold , he went out without warm coat A.If B.Although C.Since D.However