Scientists are now looking for cheaper way to use solar energy to heat air and water. Many buildings are using solar energy to heat their water now. Solar unit on the roofs of buildings collect the energy and use it to heat water. Although these units are still very expensive, more and more people are buying solar hot water heaters. Universities and colleges give solar energy courses where students learn to build their own solar collectors. They are also many books that explain the construction of solar collectors. In the future, there will be more and more solar collectors, especially in the sunny desert areas of the world.

46. What are the scientists doing now?_____________________

47. Are solar units cheap or expensive? ______________________

48. Where do students learn to build their own solar collectors __________

49. Do you think solar energy is expensive__________________

50. Why do(n’t) you think so? _____________________________

1. She couldn’t help___________ tears when she read the news about the difficult situations of medical staff in the fight against COVID-19.

A. shed

B. to shed

C. shedding

D. sheds

2. Students stopped ________ noise when the teacher came in.

A. make

B. to make

C. making

D. made

3. My parents don’t let us _____ violent movies.

A. to watch

B. watch

C. Watching

D. watches

4. Students/ be interested/ do/ online exercises/ when/ at home.

A. Students are interested in doing online exercises when they are at home.

B. Students are interested doing online exercises when they are at home.

C. Students were interested in doing online exercises when they are at home.

D. Students were interested doing online exercises when they were at home.

5. People/ not allow/ get together/ crowded places/ everywhere/ Vietnam/ now.

A. People are not allowed to get together in crowded places everywhere in Vietnam now.

B. People are not allowed getting together in crowded places everywhere in Vietnam now.

C. People are not allowing to get together in crowded places everywhere in Vietnam now.

D. People are not allowing getting together in crowded places everywhere in Vietnam now.

6. The government/ make/ every effort/ stop/ rapid spread/ COVID-19.

A. The government has made every effort stop the rapid spread of COVID-19.

B. The government has made every effort stopping the rapid spread of COVID-19.

C. The government has made every effort to stop the rapid spread of COVID-19.

D. The government has made every effort to stop the rapidly spread of COVID-19.

11. She couldn’t help___________ tears when she read the news about the difficult situations of medical staff in the fight against COVID-19.

A. shed

B. to shed

C. shedding

D. sheds

12. Students stopped ________ noise when the teacher came in.

A. make

B. to make

C. making

D. made

13. My parents don’t let us _____ violent movies.

A. to watch

B. watch

C. Watching

D. watches

14. Students/ be interested/ do/ online exercises/ when/ at home.

A. Students are interested in doing online exercises when they are at home.

B. Students are interested doing online exercises when they are at home.

C. Students were interested in doing online exercises when they are at home.

D. Students were interested doing online exercises when they were at home.

15. People/ not allow/ get together/ crowded places/ everywhere/ Vietnam/ now.

A. People are not allowed to get together in crowded places everywhere in Vietnam now.

B. People are not allowed getting together in crowded places everywhere in Vietnam now.

C. People are not allowing to get together in crowded places everywhere in Vietnam now.

D. People are not allowing getting together in crowded places everywhere in Vietnam now.

16. The government/ make/ every effort/ stop/ rapid spread/ COVID-19.

A. The government has made every effort stop the rapid spread of COVID-19.

B. The government has made every effort stopping the rapid spread of COVID-19.

C. The government has made every effort to stop the rapid spread of COVID-19.

D. The government has made every effort to stop the rapidly spread of COVID-19.

12. She couldn’t help___________ tears when she read the news about the difficult situations of medical staff in the fight against COVID-19.

A. shed

B. to shed

C. shedding

D. sheds

13. Students stopped ________ noise when the teacher came in.

A. make

B. to make

C. making

D. made

14. My parents don’t let us _____ violent movies.

A. to watch

B. watch

C. watching

D. watches

18. Students/ be interested/ do/ online exercises/ when/ at home.

A. Students are interested in doing online exercises when they are at home

B. Students are interested doing online exercises when they are at home.

C. Students were interested in doing online exercises when they are at home.

D. Students were interested doing online exercises when they were at home.

19. People/ not allow/ get together/ crowded places/ everywhere/ Vietnam/ now.

A. People are not allowed to get together in crowded places everywhere in Vietnam now.

B. People are not allowed getting together in crowded places everywhere in Vietnam now.

C. People are not allowing to get together in crowded places everywhere in Vietnam now.

D. People are not allowing getting together in crowded places everywhere in Vietnam now.

20. The government/ make/ every effort/ stop/ rapid spread/ COVID-19.

A. The government has made every effort stop the rapid spread of COVID-19.

B. The government has made every effort stopping the rapid spread of COVID-19.

C. The government has made every effort to stop the rapid spread of COVID-19.

D. The government has made every effort to stop the rapidly spread of COVID-19.

12. She couldn’t help___________ tears when she read the news about the difficult situations of medical staff in the fight against COVID-19.

A. shed

B. to shed

C. shedding

D. sheds

13. Students stopped ________ noise when the teacher came in.

A. make

B. to make

C. making

D. made

14. My parents don’t let us _____ violent movies.

A. to watch

B. watch

C. watching

D. watches

18. Students/ be interested/ do/ online exercises/ when/ at home.

A. Students are interested in doing online exercises when they are at home

B. Students are interested doing online exercises when they are at home.

C. Students were interested in doing online exercises when they are at home.

D. Students were interested doing online exercises when they were at home.

19. People/ not allow/ get together/ crowded places/ everywhere/ Vietnam/ now.

A. People are not allowed to get together in crowded places everywhere in Vietnam now.

B. People are not allowed getting together in crowded places everywhere in Vietnam now.

C. People are not allowing to get together in crowded places everywhere in Vietnam now.

D. People are not allowing getting together in crowded places everywhere in Vietnam now.

20. The government/ make/ every effort/ stop/ rapid spread/ COVID-19.

A. The government has made every effort stop the rapid spread of COVID-19.

B. The government has made every effort stopping the rapid spread of COVID-19.

C. The government has made every effort to stop the rapid spread of COVID-19.

D. The government has made every effort to stop the rapidly spread of COVID-19.

SPEAKING Look at photo A of students using their tablets in a lesson. Speculate about the questions below.

1 What subject is it? (Choose from the list below.)

2 What are they doing with their tablets?

A: It may / might / could be...

B: They may/might/could be (+ -ing)...

School subjects

art      design and technology      drama      English      geography      history     

I.C-T. (information and communication technology)

maths      music PE. (physicaleducation)      science

1.“Do you live in this house, Nam?”

-> They asked

2. “What are you doing, kids?”

-> The man asked 

3.   “I must wash these clothes now” – Mrs. Lien said

-> Mrs. Lien said 

4. The last time Mr. John was in Viet Nam was in 2007.                                    -> Mr. John hasn’t 

5. The book is interesting to me.                                                                         -> I am