Một bếp điện có ghi 220V – 1000W được mắc vào mạng điện có hiệu điện thế
220V để đun sôi 3 kg nước có nhiệt độ ban đầu là 200C. Biết hiệu suất của bếp là 80%,
nhiệt lượng cung cấp cho nước sôi được coi là có ích.
a. Tính nhiệt lượng cần cung cấp để đun sôi nước. Biết nhiệt dung riêng của nước là
4200J/kg.K.
b. Tính nhiệt lượng do bếp toả ra ?
c. Tính tiền điện phải trả cho việc sử dụng bếp trên trong 1 tháng (26 ngày), biết mỗi
ngày sử dụng bếp 5 giờ và giá điện trung bình là 1300 đồng/kW.h

❖ Change into reported speech :
1. She said, “I don't know why I am so tired today.”

2. He said, “I will give the money back tomorrow.”
3. He told me, “I’ll fix your bike today.”
4. Lan said: “ I am a student”
5. “Do your sister and brother go to the same school?” She asked Nam
6. “Where do you live?” Lan asked Teo
7. “How long have you learnt English?” She asked Lan
8. Hoa asked Ba “How long will you stay in Hue?”
9. “Do you enjoy reading?” Phong asked Peter
10. “Does she like sports?” Hoa asked Lan
11. Ba asked Tam “How often do you wash your clothes?”
12. “When will your father leave Vietnam for the USA?” Phong asked Thu
13. “How many books do the students need?” The librarian asked my teacher
14. “Do you like chicken? “ Lan asked Hoa
15. “ Are you a student?” Lan asked me

1) He is a strict ............................( examine)
2) It is a very ................... journey. ( interest)
3) Nguyen Du, one of famous Vietnamese....................wrote "Truyen Kieu". (poem)
4) I saw your school’s ......................in today’s edition of the Vietnam News. ( advertise)
5) If you want to .......................... your English , we can help you. ( improvement)

II. Supply the correct verb form.
1. If you................... ( study ) hard, you will pass the written examination.
2. If the weather ........................( be ) fine, We will go for a picnic.
3. He ........................( write ) to you if he has time.
4. They........................ ( have ) a lot of fun if they come there.
5. If she.................. ( not hurry ), she will miss the bus.
6. Mai asked Hoa how she___________ ( be)
7. He said he .......................( go ) to HCM city the following day.
8. She asked me if my school.......................... ( be ) near there.
9. Maryam said she..................... ( must ) go then.

10. I asked her where she .....................( live ).

I. Choose the best answer
1. If she............................time, she will write to you.
a/ have                b/ has                 c/ will have                      d/ had
2. If you want to lose weight , you ...........................go on a strict diet.
a/ can              b/ could                c/ should                d/ might
3. If Mary doesn’t improve in English, we.................... find a tutor for her.
a/ might            b/ could               c/ have to                    d/ would

4. You .......................pass the driving test, if you follow the instructor’s advice.
a/ ought            b/ can                c/ could                     d/ had
5. If you study hard, you.......................pass the exam.
a/ would            b/ will             c/ must                  d/ should
6. She asked me if I ....................................pop music.
a/ liked           b/ likes                c/ like                     d/ has liked
7. She asked me ...................
a/ if I am thirsty     b/ If I was thirsty      c/ If I were thirsty          d/ If was I thirsty
8. The man asked me if I ............................a student.
a/ am            b/ were             c/ was              d/ will be
9. He said he .....................to visit me the following day.
a/ will come        b/ would come          c/ came               d/ come
10. She asked him if he ..........................play tennis.
a/ can           b/ will            c/ would                d/ must
11. His father asked him if he ........................the exam.
a/ pass          b/ passed                c/ will pass                   d/ passes
12. He asked me where I ......................... then ?
a/ live           b/ lived              c/ would live                  d/ had lived
13. My father said I ...........................learn hard.
a/ have to          b/ must               c/ had to                    d/ can
14. She aksed me how many languages I ..........................
a/ can speak       b/ could speak           c/ speak              d/ will speak
15. I asked his brother how he......................to school.
a/ goes       b / go             c/ will go               d/ went

❖ Change into reported speech :
1. She said, “I don't know why I am so tired today.”

2. He said, “I will give the money back tomorrow.”
3. He told me, “I’ll fix your bike today.”
4. Lan said: “ I am a student”
5. “Do your sister and brother go to the same school?” She asked Nam
6. “Where do you live?” Lan asked Teo
7. “How long have you learnt English?” She asked Lan
8. Hoa asked Ba “How long will you stay in Hue?”
9. “Do you enjoy reading?” Phong asked Peter
10. “Does she like sports?” Hoa asked Lan
11. Ba asked Tam “How often do you wash your clothes?”
12. “When will your father leave Vietnam for the USA?” Phong asked Thu
13. “How many books do the students need?” The librarian asked my teacher
14. “Do you like chicken? “ Lan asked Hoa
15. “ Are you a student?” Lan asked me

❖ Use “SO” and “ BECAUSE” to rewrite the following sentences.
1. They couldn’t help you. They were not here.
→ .........................................................................................................
→ .........................................................................................................
2. I can’t go out. It’s raining.
→.........................................................................................................
→.........................................................................................................
3. We haven’t got any food. We are going shopping
→.........................................................................................................
→.........................................................................................................
4. There was fog. Their flight was delayed
→.........................................................................................................
→ .........................................................................................................
5. The film was boring. We decided to go home
→.........................................................................................................
→.........................................................................................................