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

13. We have chatted on the phone since it began to rain.

14.We have known each other since we were at university.

15.She hasn't phoned her parents for 3 weeks.

16.We haven't been to this restaurant for a long time.

17.How long have you had the laptop?

18.I haven't joined such an exciting party before.

20.The last time I heard from her was many years ago.

21.The last time the children were taken to the park was in 2012.

22.This is not our first visit to this city.

23.I have seen this movie twice.

24.He has been to a tennis match twice.

25.She has done the housework since she got home.