phương trình hóa học nào dưới đây cân bằng  đúng

A Fe3 +OH ----->3Fe+2H2O
b H2O ----> H2 +O2

c h2O2---> H2O+O2

D Mg(OH)2 ---> MgO +H2O

Rewrite the following sentences 1.Tom began playing the piano 4 years ago. 🡪Tom has…………………………………………………………….. 2. I started cooking for the party 4 hours ago. 🡪I have…………………………………………………………………….. 3. She started working as a secretary 2 years ago. 🡪She………………………………………………………………………….. 4. My father is reading a newspaper. He started 2 hours ago. 🡪My father……………………………………………... 5.My sister began to study English a year ago. 🡪My sister………………………………………….. 6.Scientists began to fight against AIDS in 1980. 🡪Scientists have…………………………………………………... 7.The Browns have lived in London for 20 years. 🡪The Browns began……………………………………………………………. 8. John has worked for this electronics firm since 1999. 🡪John started……………………………………………………….. 9. Women have fought for their rights since the middle of the 20th century. 🡪Women began………………………………………………………….. 10. Jack and Jill have learned to drive for 2 weeks. 🡪Jack and Jill started…………………………………………………………... 1.Tom has not had his hair cut for over 3 months. 🡪It’s………………………………………………………………. 2.M father hasn’t been to Hanoi for 2 years. 🡪It is……………………………………………………………………. 3.I haven’t enjoyed myself so much for years. 🡪It is………………………………………………………………….. 4. I haven’t eaten this kind of food for 2 years. 🡪It is………………………………………………………………... 5.Mary hasn’t rung for hours. 🡪It is………………………………………………………………. 6.We haven’t seen him for 4 years. 🡪It is……………………………………………………………………………. 7.It’s over a year since I last went to see them. 🡪I haven’t………………………………………………………….. 8.It’s more than ten years since I last played football. 🡪I haven’t……………………………………………………………….

                                         HEALTH AND FITNESS

               advice          unfit            change           on a diet        balanced

               slim              a little          healthy           too much       keep fit

Do you feel good? Are you fit and (1)                          ? Maybe you think you are overweight and need to go (2)                             . Or maybe you are a little (3)                                    and need to put on weight. Here is some (4)                                    for you. Firstly, it is important not to do things that are bad for you - so, do not eat (5)                                 or go to bed too late. If you have an unhealthy lifestyle, try to (6)                                   some of the thinhs you do - only do the thinhs that are good for you. Make sure you eat a (7)                                   diet, including a lot of fresh fruit and vegetables. Do plenty of exercise to (8)                               : go running in the morning, or join your local gym. If you are very (9)                                      , though, you should start with just (10)                                          swimming.