1.D. spring

2.A. food

3.C. cushion

4.B. pizza

5.C. candle

6.A. stripe

7.D. survey

8.A. ‘suitable

9.C. bathe

10.B. handed

1.D. information

2.B. invite

3.A. woman

4.B. enter

5.C. again

6.D. begin

1.A. go to

2.A. in / of

3.B. must

4.D. is going to

5.C. well enough

6.B. yourselves

7.A. of

8.C. ought to

9.B. visited

10.D. go

11.D. reserved

12.B. dangerous

13.A. over / up

14.C. rises/ sets

15.C. doing

16.A. shouldn’t

17.B. for

18.B. should

19.C. cycling

20.B. have to

21.B. should

22.D. for – in

23.B. crowded

24.A. have to

25.B. has to

26.C. greeting

27.A. touch

28.A. custom

29.B. tradition

30.D. address

31.D. five-coloured

32.C. passed down

33.B. table manners

34.A. take off

35.A. comment

36.A. should

37.B. don’t have to

38.D. have to

39.C. mustn’t

40.A. shouldn’t

1.It’s very exciting to fly a kite in the countryside.

2.I started doing voluntary work three years ago.

3.We do not have to change the dates of our trip.

4.Would you like me to show you how to use this?

5.I spent two hours walking to her village.

6.The Museum of Ethnology is visited by millions of tourists every year.

7.Jane’s sister doesn’t make crafts as well as Jane.

8.Amy suggested going to her uncle’s farm at the weekend.

1.must 

2.must

3.shouldn’t 

4.don’t have to 

5.should 

6.have to 

7.mustn’t 

8.must 

9.don’t have to 

It’s very exciting to fly a kite in the countryside.

I started doing voluntary work three years ago.

We do not have to change the dates of our trip.

Would you like me to show you how to use this?

I spent two hours walking to her village.

The Museum of Ethnology is visited by millions of tourists every year.

Jane’s sister doesn’t make crafts as well as Jane.

Amy suggested going to her uncle’s farm at the weekend.

1.Although he had a fever, he tried to finish his math test.

2.In spite of having a lot of money, I do not have a happy life.

3.Despite eating plenty of fresh fruits and vegetables, our skin is not beautiful.

4.Even though the tomatoes were green, she ate them.

5.Computer games are fun, yet some of them are very violent.

6.Although she did not finish her homework, she still went to sleep.

7.In spite of the foggy weather, the flight was not delayed.

8.Despite the traffic light turning red, we did not stop.

9.Even though MaryAnn does not like her manager, she still went to his party.

1.Mr. Thanh hates doing housework, but he still cleans the house once a week.

2.I am having a holiday with my family in Mai Chau now. We spend our summer holidays here every year.

3.It is important for children to learn some life skills at home.

4.Parents have to teach their children to be honest and show respect to older people from an early age.

5.Jane is thinking of applying for another job. She thinks her present job is boring.

6. Doing housework helps children learn to take care of themselves.

Gọi  X là tổng số học sinh

Số học sinh của lớp 6A: chiếm 2/5​ tổng số học sinh, nên:

Số học sinh lớp 6A là: 2/5 x X 

Số học sinh còn lại sau khi trừ đi lớp 6A: X−2/5 x X =3/5x X 

Số học sinh của lớp 6B: chiếm 1/6  số học sinh còn lại, nên:
Số học sinh lớp 6B=16×3/5 x X=3/30 x X=1/10 x X

Số học sinh còn lại sau khi trừ đi lớp 6A và 6B:

3/5 x X − 1/10 x X = 6/10 x X − 1/10 x X = 5/10 x X = 1/2 x X

Theo đề bài, số học sinh lớp 6C là 26 học sinh, tức là số học sinh còn lại chính là 26 học sinh:
1/2 x X = 26

             X=26×2=52

Vậy, tổng số học sinh của khối 6 là: 52

Chúc em hoàn thành bài tốt và sớm được ngủ nhé! 😄

kq đây bạn nhé

S=[n(n+1)(n+2)​ ] / 3

S=∑​k⋅(k+1) với k chạy từ 1->n