1.       Nuclear energy is … , but it is dangerous .

A.      Renewable         B. non-renewable        C. natural resource          D. fossil fuel

1.       fossil fuels are very common in our society but they … the environment .

A.      Waste          B. pollute          C. renew          D. provide

2.       All the house in our village will be … by solar energy .

A.      Frozen          B. widened          C. heated          D. heightened

3.       Several governments try to … the use of fossil fuels .

A.      waste          B. save          C. reduce          D. increase

4.       at this time next week , we … a wind turbine in our garden .

A.      will installed          B. will be installing          C. install          D. installed

5.       low energy light bulbs should be used to … electricity .

A.      convert          B. save          C. spend          D. buy

6.       it is a good idea to use … when travelling long distances .

A.      private cars          B. public transport          C. cars          D. taxis

7.       “why is it called a … source ?” – “ because it can be replaced easily and quickly ”.

A.      renewable          B. non-renewable          C. effective          D. specific

8.       we must … the amount of water our family use every day .

A.      lessen          B. narrow          C. lower          D. reduce

9.       wave energy is a source of … energy .

A.      environmental friendly           B. environmentally friendliness           

C.    environment friendly                 D. environmentally friendly

11. alternative sources of energy … developed in the near future .

A. has been           B. will be          C. is          D. was

12. she … cooking in the kitchen at 7 PM tomorrow .

A. will           B. is           C. will be           D. be

13. some new energy-saving bulbs … in the dining room .

A. will be put           B. will put be           C. will put           D. will be putting

14. what should we do to … electricity ?

A. take           B. save           C. cut           D. waste

15. the wind , the sun , and the wave are some types of … sources of energy .

A. cheap           B. costly           C. changeable           D. alternative

1.       Nuclear energy is … , but it is dangerous .

A.      Renewable         B. non-renewable        C. natural resource          D. fossil fuel

1.       fossil fuels are very common in our society but they … the environment .

A.      Waste          B. pollute          C. renew          D. provide

2.       All the house in our village will be … by solar energy .

A.      Frozen          B. widened          C. heated          D. heightened

3.       Several governments try to … the use of fossil fuels .

A.      waste          B. save          C. reduce          D. increase

4.       at this time next week , we … a wind turbine in our garden .

A.      will installed          B. will be installing          C. install          D. installed

5.       low energy light bulbs should be used to … electricity .

A.      convert          B. save          C. spend          D. buy

6.       it is a good idea to use … when travelling long distances .

A.      private cars          B. public transport          C. cars          D. taxis

7.       “why is it called a … source ?” – “ because it can be replaced easily and quickly ”.

A.      renewable          B. non-renewable          C. effective          D. specific

8.       we must … the amount of water our family use every day .

A.      lessen          B. narrow          C. lower          D. reduce

9.       wave energy is a source of … energy .

A.      environmental friendly           B. environmentally friendliness           

C.    environment friendly                 D. environmentally friendly

11. alternative sources of energy … developed in the near future .

A. has been           B. will be          C. is          D. was

12. she … cooking in the kitchen at 7 PM tomorrow .

A. will           B. is           C. will be           D. be

13. some new energy-saving bulbs … in the dining room .

A. will be put           B. will put be           C. will put           D. will be putting

14. what should we do to … electricity ?

A. take           B. save           C. cut           D. waste

15. the wind , the sun , and the wave are some types of … sources of energy .

A. cheap           B. costly           C. changeable           D. alternative

cảm ơn ạ 

a. 40/16 = 10/4 , 84/21 = 28/7 = 4

\(a,\frac{40}{16}=\frac{40:4}{16:4}=\frac{10}{4}=\frac{10\times20}{4\times20}=\frac{200}{80}\)

\(b,\frac{84}{21}=\frac{84:3}{21:3}=\frac{28}{7}\)

a , Điểm O nằm giữa một điểm bất kì khác O của tia Ox và một điểm bất kì khác O của tia Oy.

Vẽ hình:

b , không còn cách nào khác kết quả trên 

sẻ

Sẻ

sáo

1. C

2. B

3. C

#ĐN

1. What is the main idea of the passage?

A. Air pollution is a serious problem in all cities.      B. Air pollution is a serious problem in countries.

C. Air pollution is a serious problem in many cities.

D. Air pollution is a serious problem with the governments.

2. According to the passage, city wastes cause ________.

A. air pollution                  B. water pollution    C. soil pollution       D. noise pollution

3. What does the word "it" in the passage refer to?

A.        garbage                 B. pollution             C. water                  D. problem

4. The word "different" is closest in meaning to ________.

A. like                                B. same                  C. similar                D. various

C

A

a

d

CAAD

Hiệu của 2 số đó là 12 + 1 = 13

hiệu của hai số là 12+1 =13

hiệu của hai số là 12+1=13

Hok tốt

*6=86 và *=3

a)*6=86 và *=3

b)2*=23 và *4= 54

c)2*=23 và*7=17

1;4;5;9;14;23

Quy luật ở đây là kể từ số thứ 3 thì số đằng sau bằng tổng 2 số đứng trước nó. Đây chính là dáy số Fibonacci

1,4,5,9,... suy ra:

Quy luật ở đây là kể từ số thứ 3 thì số đằng sau bằng tổng 2 số đứng trước nó. Đây chính là day số Fibonacci

khong can biet chép bài của mình