There is a change in animals living pattern because noise pollution happens

→Noise pollution causes a change in living pattern .

.Tom is the best football player in this team.

- Nobody in this team is play football better than Tom .

Choose the word whose underlined part is pronounced differently from the others in each group. Identify your answer by writing the corresponding letter A, B, C or D on your answer sheet.

1. A. switch B. stomach C. match D. catch

2. A. laughs B. cars C. stops D. works

3. A. watched B. reduced C. coughed D. raised

4. A. three B. through C. without D. thank

5. A. angle B. face C. page D. angel

Choose one word whose underlined part is pronounced differently from the others by circling the corresponding letter A, B, C, or D.

1. A. claim B. wait C. said D. paid

2. A. watch B. bath C. want D. wash

3. A. sure B. mixture C. injure D. pleasure

4. A. few B. new C. threw D. knew

5. A. clothes B. matches C. colleges D. churches

6. A. watched B. naked C. liked D. looked

7. A. sunbathe B. father C. theater D. weather

8. A. pour B. four C. flour D. resource

9. A. clear B. wear C. bear D. ware

10. A. sixty B. my C. sky D. fly

Fill in each blank with a suitable word

How Nam has improved his English.

In the first year of lower secondary 1…school…………………., I had some difficulties in learning English. My English pronunciation 2…was……………………. really bad and my English grammar was worse. I did not 3…know……………………..how to improve them. I didn’t want my father 4……and…………………… mother to know about this. One afternoon after the lesson, my teacher 5……of…………….......................... English told me to wait 6……for……………………… her outside the classroom. She took 7………me………………… to the school library and showed me tapes of pronunciation drills kept in a glass bookcase. She also told me how to use an English- English dictionary to 8……improve………………………. my English grammar. “Now I think you know what you should do” she said. I made much progress and only one year later, I won the first 9…prize………………… in the English Speaking Contest 10…held…………………for secondary school students in my hometown

Give the correct form of the words in parentheses ( 1m)

1. Life is more . . . comfortable. . . . ………………………..………… ………… . . now. (comfort)

2. There are many cultural…differences……………..…..between his country and mine. (differ)

3. It is . . . . unhealthy………………. . . …………………… to eat much sugar and fat. (health)

4. These medicines can work well with your . . illness. …………….………... . . . . . (ill)

5. There was no . . .explaination . . ……………….. . for his absence from class yesterday. (explain)

6. Is he sleeping ? - No, he is still……awake………………………………………. (wake)

7. Every week, there are two…flights……………from Ha Noi to Ho Chi Minh city. (fly)

8. They had an . . . …enjoyable…………………………………..... Christmas vacation. (enjoy)

9. He is a well- known ……photographer…………………………………………………. (photograph)

10. The ……performance……………………...……..she gave last night was marvelous. (perform)

số các số hạng là:

(2n-1-1):2+1=n(số)

tổng A là:(2n-1+1)n:2=n.n=n² là số chính phương

=>A là số chính phương

=>đpcm

đặt  A=2+2²+2³+........+2¹⁰⁰

2A=2(2+2²+2³+........+2¹⁰⁰)

2A=2²+2³+2⁴+........+2¹⁰¹

2A-A=(2²+2³+2⁴+........+2¹⁰¹)-(2+2²+2³+........+2¹⁰⁰)

A=2¹⁰¹-2

a little

A=2+2²+2³+...+2¹⁰⁰¹

2A=2²+2³+2⁴+...+2¹⁰⁰¹+2¹⁰⁰²

2A-A=2²+2³+2⁴+...+2¹⁰⁰¹+2¹⁰⁰²

A=2+2¹⁰⁰²