1 environmental

2 Polluting

3 conservation

4 consumption

5 appliances

6 innovation

7 Ultimately

8 suggestion

9 heated

10 environmentalists

11 worried

12protection

13 seriously

14 dripping

15 reducing

environmental

polluted

conservation

consumption

appliances

innovation

ultimately

suggestion

heated

environmentalists

worried

seriously

dripping

reducing

ai xóa ctl của mình vậy?

Tham khảo:)

1. My father used to live in small village when he was a girl.
2. There did not use to vehicles on the road before.
3. We used to cycle to school two years ago.
4. Now there are many traffic accidents.
5. My brother used to go swimming when he was a child.

6. I didn’t go to school because I was sick.  ->I was sick, so I didn’t go to school.

7. It will be good if you eat less meat and more vegetables.

-> You should eat less meat and more vegetables

8. He likes playing computer games in his free time.à His hobby is playing computer games

9. I am interested in watching TV in the evening.à I enjoy watching TV in the evening

10. I think that learning English is important.à I find learning English important

11.My brother enjoys coffee very much. -> Coffee is my brother’s favorite drink.

12.What is the price of a plate of fried rice? -> How much is a plate…hoặc.. does a plate … cost?

13. This food has some meat and tofu. -> There is some meat and tofu in this food.

14. Chicken is my sister’s favorite food. (likes) ->My sister likes chicken very much.

15. There is sugar in many kinds of food. (have) -> Many kinds of food have sugar.

1D 2B 3C 4A 5A 6C 7A 8A 9B 10A 11C 12D 13D 14D 15A 16D 17A 18C 19C 20D 21D 22C 23C 24A 25B 26C 27D 28B 29C

15)

ĐKXĐ: \(x\ge1\)

Ta có: \(\sqrt{x+3}+\sqrt{x-1}=2\)

\(\Leftrightarrow2x+2+2\sqrt{\left(x+3\right)\left(x-1\right)}=4\)

\(\Leftrightarrow2\sqrt{\left(x+3\right)\left(x-1\right)}=2-2x\)

\(\Leftrightarrow\sqrt{\left(x+3\right)\left(x-1\right)}=1-x\)

\(\Leftrightarrow\left(x+3\right)\left(x-1\right)=\left(1-x\right)^2\)

\(\Leftrightarrow x^2-x+3x-3=x^2-2x+1\)

\(\Leftrightarrow2x-3+2x-1=0\)

\(\Leftrightarrow4x-4=0\)

\(\Leftrightarrow4x=4\)

hay x=1(thỏa ĐK)

Vậy: S={1}

15 A

16 D

17 A

18 C

19 D

20 B

21 B

22 D

23 A

Quê hương em với cánh đồng bao la thẳng cánh cò bay. Mỗi buổi sớm thức dạy, các bác nông dân đang làm việc miệt mài. Những chú chim hót vang rội rã trên những con đường làng. Xa xa những cô cậu học trò đang bước chân tới trường.Thấp thoáng những đám mâybồng bềnh trôi theo gió. Nhưng bông hoa đua nhau khoe sắc, chị gió lướt qua với những làn gió nhè nhẹ của buổi sáng sớm. Em yêu cánh đồng, yêu những con sống và yêu nhất những con người nơi đây. Bức tranh vẽ về người nông dân đang làm việc buổi sáng thật nhiều màu sắc. 

15.had never seen-visited

16.am doing

17.am reading

18.am still waiting

19.are they speaking

20.is stealing

21.was working-was shopping