Rewrite the following sentences in direct speech :
1. The boss asked me how many languages I could speak.
2. My friends wanted to know if he would stay there with me some more days.
3. I wordered if they were going to build a new school in that area the following year.
4. They wanted to discover what made the new land different from others.
5. People wondered why the security of the earth would be threatened.
6. Nhung said that she would be a good teacher of Math someday.
7. Nam told me that they hadn't been at the Club the night before.
8. She told me that I could try it then if I liked.
9. He said that he was going to hire a robot the following Saturday.
10. Mary told me that her parents didn't want her to participate in that project.

Rewrite the follow sentences using " whether or question words" before to-infinitives :
1. "When should I turn off the computer ?" Giang asked Nam. => Giang asked ......................
2. I wonder what I should say to him at present. => I wonder ......................
3. They can't decide what they should buy for her as a present. => They can't decide ......................
4. "Should I give this to him ?" he asked himself. => He wondered ......................
5. "Should I make friend with him ?" Lan said. => Lan had no idea ......................
6. "Where should we meet ?" she said. => She didn't know ......................

Cho 62,8g hỗn hợp gồm hai muốn NaHSO3 và Na2CO3 vào 200g dung dịch HCl 14,6%.
a, Tính %m mỗi muối trong hỗn hợp ban đầu.
b, Tính nồng độ phần trăm mỗi chất trong dung dịch sau phản ứng.

Viết phương trình phản ứng hóa học của nước với :
a, Lưu huỳnh trioxit
b, Cacbon đioxit
c, Điphotpho pentaoxit
d, Canxi oxit
e, Natri oxit

Viết phương trình phản ứng hóa học của KOH tác dụng với :
a, Silic oxit
b, Lưu huỳnh trioxit
c, Cacbon đioxit
d, Điphotpho pentaoxit

Viết các phương trình phản ứng hóa học theo sơ đồ sau :
\(Na_2O\underrightarrow{\left(1\right)}NaOH\underrightarrow{\left(2\right)}Na_2SO_3\underrightarrow{\left(3\right)}SO_2\underrightarrow{\left(4\right)}K_2SO_3\)

Make a complete paragraph about disadvantages/ drawbacks of city life :
1. People/ who/ live/ large cities/ face/ lot/ problems/ daily life.
2. Firstly/ housing shortage/ become/ more and more serious/ big cities./ Many people/ cannot/ afford/ buy/ own houses/ so/ they/ have/ rent/ and/ live/ small rooms.
3. Furthermore,/ noise/ traffic/ construction sites/ have/ bad impact/ citizens' health./ More and more people/ get/ hearing problems/ suffer/ insomnia.
4. Lastly,/ crime/ always/ most complicated problem/ and/ it/ more severe/ city./ The increase/ population and financial pressure/ lead/ numerous criminal activities/ such/ burglary, robbery and violence.
5. In short,/ city life/ getting/ more difficult/ its dwellers.

Viết lại câu giữ nguyên nghĩa :
1. He doesn't play the guitar as well as Henry. => Henry plays ...............
2. Hang's house is farther from the city centre than my house. => My house is ...............
3. Nobody in our class is more intelligent than Jane is. => Jane is ...............
4. No animal in the world is as big as a whale is. => A whale is ...............
5. Laura reads more quickly than her brother does. => Her brother ...............
6. Jack is the tallest student in this class. => No ...............
7. Jane is a better swimmer than Mary. => Jane swims ...............
8. She is a more careful driver than I am. => She drives ...............
9. Joe dances more gracefully than his partner. => Joe's partner ...............
10. Is this the cheapest pet food you have got ? => Have you ............... ?
11. My book isn't as interesting as yours. => Your book is ...............
12. His car runs faster than a race car. => A race car ...............
13. He speaks Spanish more fluently than I do. => I ...............
14. Her watch isn't as expensive as mine. => My watch ...............
15. You have to remove your shoes before going inside the house. => You ...............
16. I waited for my friend for 2 hours, but he didn't arrive. (up) => Although I waited ...............
17. It took me a few days to cover from my flu. (got)
18. Lan and her sister don't have a good relationship with each other because they usually quarrel.(get)