Chất X có công thức phân tử C4H8O2.Khi cho X td với dung dịch NaOH,đun nóng, sau phản ứng thu đc chất Y có công thức CHO2Na.Công thức của X là :

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1. What is the word that has the same meaning as "well known for"? * 1 điểm beautiful for famous for excellent for wonderful for 2. One of the _______ in our class is from Japan. * 1 điểm student students 3. We are all ____________ about going on the picnic. * 1 điểm interested fond excited enjoy 4. The government provide food _____ the poor. * 1 điểm for with to 5. The Red Cross is a(an) _________ organization that helps people for free. * 1 điểm for profit profit making non profit 6. Our river is ________ polluted. * 1 điểm heavily heavy heaviliness 7. Volunteer can ________ a difference in the community. * 1 điểm do take make 8. We help people in _____ by providing them with food, clothing, housing and so on. * 1 điểm case need use 9. Because all the rivers are dirty, we should __________. * 1 điểm take them up sweep them up clean them up 10. In our school, we _______ fund to help disabled children. * 1 điểm make organize raise 11. ______ people don't have their own houses. They live on the streets, under the bridges or in camps. * 1 điểm homeless poor sick 12. I ________ this movie 3 times. * 1 điểm saw see have seen 13. It is raining hard outside, ________ we should take an umbrella. * 1 điểm because so and 14. Choose the word that has the same meaning as "join" * 1 điểm take part participate in join hand in 15. There are 3 pencils on the table. One is blue and __________ are red. * 1 điểm other the others another Mọi người ơi làm cho em trong vòng 5 phút ạ, ko cần giải thích chỉ cần ghi đáp án a, b ,c ,d thôi ạ