Bài 8:

a) Biết 5 lít nước biển chứa 160g muối, Hỏi muốn có 16 tấn muối cần bao nhiêu m³ nước biển?

b) Cho biết 5 lít nước biển chứa 175g muối, hỏi 3m³ nước biển chứa bao nhiêu kg muối?

c) Hai thanh đồng có thể tích 13 cm³ và 17 cm³. Hỏi mỗi thanh đồng nặng bao nhiêu gam? Biết khối lượng cả hai thanh là 192g.

d) Học sinh của ba lớp 7 cần trồng và chăm sóc 24 cây xanh. Lớp 7A có 32 học sinh, lớp 7B có 28 học sinh, lớp 7C có 36 học sinh. Hỏi mỗi lớp phải trồng và chăm sóc bao nhiêu cây xanh? Biết số cây xanh mỗi lớp trồng tỉ lệ với số học sinh lớp đó.

Bài 7:

a) Một ô tô chạy từ A đến B với vận tốc 50 km/h thì mất 6 giờ. Hỏi nếu ô tô đó chạy từ A đến B với vận tốc 30 km/h thì mất bao nhiêu thời gian?

b) Một ô tô chạy từ A đến B với vận tốc 72 km/h thì mất 5 giờ. Hỏi nếu ô tô đó chạy từ A đến B với vận tốc 60 km/h thì mất bao nhiêu thời gian?

c) Một đội công nhân làm đường lúc đầu dự định làm xong một con đường trong 30 ngày. Nhưng sau đó đội bị giảm đi 10 công nhân nên đã hoàn thành con đường trong 40 ngày. Hỏi lúc đầu đội có bao nhiêu công nhân? (biết rằng năng suất mỗi công nhân là như nhau).

d) Một đội công nhân xây dựng lúc đầu dự định xây xong một căn nhà trong 20 ngày. Nhưng sau đó đội bị giảm đi 20 người nên đã hoàn thành trễ hơn dự định 10 ngày. Hỏi lúc đầu đội có bao nhiêu công nhân? (biết rằng năng suất mỗi công nhân là như nhau).

Viết 5 từ chỉ hoạt động học tập

Exercise 10. Turn these sentences into passive voice.

1. People invented the wheel thousands of years ago.

→ The wheel..................................................................................................................

2. My father waters these flowers every morning.

→ These flowers...........................................................................................................

3. People use computers all over the world.

→ Computers.................................................................................................................

4. Are they building a statue of Chu Van An?

→ Is............................................................................................................................... ?

5. John invited Fiona to his birthday party last night.

→ Fiona..........................................................................................................................

6. They keep many ancient things in museums.

→ Many ancient things................................................................................................

7. Do four busy streets surround the Temple of Literature?

→ Is............................................................................................................................... ?

8. People make many famous films in Hollywood.

→ Many famous films..................................................................................................

9. Her mother is preparing the dinner in the kitchen.

→ The dinner.................................................................................................................

10. I do all my homework on my computer.

→ All my homework....................................................................................................

Exercise 11. Combine into one sentence with “too” or “either”.

1. They can play table tennis. We can play table tennis.

.........................................................................................................................................

2. He sings love songs very well. His sister sings love songs very well.

.........................................................................................................................................

3. I write diary every night. My mother writes diary every night.

.........................................................................................................................................

4. My father doesn’t drink beer. My mother doesn’t drink beer.

.........................................................................................................................................

5. She is swimming in the pool. Her children are swimming in the pool.

.........................................................................................................................................

6. Hoa ate bread with milk for breakfast. Hoa’s uncle ate bread with milk for breakfast.

.........................................................................................................................................

7. She didn’t watch TV last night. Her husband didn’t watch TV last night.

.........................................................................................................................................

8. They mustn’t stay up late. Their friends mustn’t stay up late.

.........................................................................................................................................

9. Milk is good for your health. Fruit juice is good for your health.

.........................................................................................................................................

10. Betty does morning exercise. Betty’s aunt does morning exercise.

.........................................................................................................................................

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Exercise 8. Complete the sentences by using as ... as; not ... as, different ... from.

1. Ms. Hoa is Mrs. Lan. (attractive)

2. Her daughter is her. (beautiful)

3. That dog it looks. (not dangerous)

4. Living in Valencia living in Paris is. (not expensive)

5. Schools in Viet Nam are schools in the USA. (different)

6. Learning French is learning English. (difficult)

7. These trees those. (same)

8. Vios Mazda 3. (not luxurious)

9. His appearance is what I have expected. (different)

10. His job is mine. (important)

Exercise 9. Supply the correct passive form of the verbs in brackets.

1. This computer (use) for two years.

2. America (discover) by Christopher Columbus.

3. I think this institution (widen) twice since 1999.

4. Sydney Opera House in Australia (finish) in 1973.

5. My sister is studying law at Viet Nam National University, Ho Chi Minh City now. This university (situate) in Thu Duc District.

6. The Great Wall in China (build) many centuries ago.

7. The Golden Gate Bridge in San Francisco (complete) in 1937.

8. The University of Cambridge (form) in 1209. It is always considered to be one of the most prestigious universities in the world.

9. BurjKhalifa in Dubai, the highest building in the world, (open) in 2010.

10. My bike ______________(steal) last week and it __________( not, find) yet.

Exercise 7. Read the passage and answer the following sentences.

On Wednesday evening, we went to the Town Hall. It was the last day of the year and a large crowd of people had gathered under the Town Hall clock. It would strike twelve in twenty minutes' time. Fifteen minutes passed and then, at five to twelve, the clock stopped. The big minute hand did not move. We waited and waited, but nothing happened. Suddenly, someone shouted “It's two minutes past twelve! The clock has stopped!” I looked at my watch. It was true. The big clock refused to welcome the New Year. At that moment, everybody began to laugh and sing.

Notes:

- strike (v): đánh, đập, điểm
- minute hand (n): cây kim phút
- suddenly (adv): đột nhiên
- refuse (v): từ chối

* Questions:

1. Where did they go on Wednesday evening?

à…………………………………………………………………………………………………

2. Was it the first day of the year?

à…………………………………………………………………………………………………

3. What time did the clock stop?

à…………………………………………………………………………………………………

4. Did the big minute hand move?

à…………………………………………………………………………………………………

5. What did everyone begin to do at that moment?

à…………………………………………………………………………………………………

Exercise 6. Write the second sentence so that it has the same meaning as the first one.

1. I've never seen such a boring movie.

à It is _________________________________________________________________

2. Many tourists visit the school every year.

à The school ________________________________________________________

3. They slice the fish and fry it in a frying pan.

àThe fish ___________________________________________________________

4. French grammar is more difficult than English grammar.

àFrench grammar ____________________________________________________

5. The new building is as high as the old one.

à The new building is the same ______________________________________________

6. What is your favourite subject?

à Which subject do _________________________________________________________ ?

7. She is very interested in computers.

à She likes ________________________________________________________________.

8. Three bananas cost 15,000 dong.

àThe price of _____________________________________________________________.

9. No building in the town is older than this church.

à This church is the ______________________________________________

10. There is a sink, a tube and a shower in the bathroom.

à The bathroom __________________________________________________.