Hãy chọn hệ số và công thức Hóa học điền vào dấu 3 chấm để có phương thức hóa học đúng.

a, ................ + O\(_2\) --> CuO

b, Al + O\(_2\) --> .....................

c, K + O\(_2\) --> ...................

d, Na + O\(_2\) --> ..................

e, CaO + H\(_2\)O --> ...................

j, Mg + ............... --> MgO

g, Fe + HCl --> FeCl\(_2\) + ..........

h, ZnO + ...... --> ZnCl\(_2\)+H\(_2\)O

Lập công thức hóa học nhanh của các chất tạo bởi.

a, Mg (II) và O

b, Fe (II) và O

c, N (III) và H

d, Fe (III) và O

e, K (I) và CO\(_3\)

g, Na (I) và SO\(_4\)

h, C (IV) và O

i, S (VI) và O

Question 5. Read the passage below and choose the correct answer to complete the passage.

In Britain, the climate is not very good. There are very few hot days and it rains a lot. Because of this, people spend a lot of time at home. Generally, British homes have a lot of furniture in them, carpets on the floors and heavy curtains. Many houses in Britain are old. Many of them are over one hundred years old. Often, they do not have enough insulation and the heat goes out through the windows, the doors and up the chimney.

Because of the climate, people in Britain have to send a lot of money on heating. Many houses have special system called “central heating”. The heats all the rooms and, at the same time, heats the hot water. Houses without central heating often have gas, electric or coal fires. The rooms in most British houses are quite small.

New houses are much better. They have two layers of glass in the windows to stop the heat going out.

41. Why do British people spend a lot of time at home ?

A. Because the climate is not very good. B. Because they don’t know where to go

C. Because the climate is very good. D. Because they want to stay at home

42. The heat goes out of the houses through ________________________.

A. the windows, the doors and up the chimney B. the windows and up the chimney

C. the doors and up the chimney D. the walls and up the chimney

43. Because of ___________, people in Britain have to spend a lot of money on heating

A. cold weather B. cool weather C. hot weather D. bad weather

44. Houses without central heating often have__________

A. only coal fires B. gas or coal fires C. electric or coal fires D. gas, electric or coal fires.

45. New houses usually have__________ in the windows to stop the heat going out.

A. only layer of glass B. two layers of glass C. three layers of glass D. two or three layers of glass

Question 4. Choose the underlined word or phrase (A, B, C or D) that needs correction, then correct it.

33. My father used to went to work by car some years ago, but now he goes by bus.

A B C D

34. A world tour can sometimes last 9 months. It must be exhausted.

A B C D

35. I spend two hours to do my washing every day.

A B C D

36. The play was so boring. Despite, Hoa saw it from beginning to end.

A B C D

37. Lan used to did morning exercise when she got up early.

A B C D

38. She’s sure that they will find the film entertained.

A B C D

39. It takes Mai 2 hours doing her report.

A B C D

40. Although being frightened by the images, Lan still liked the film so much

A B C D

Question 3. Give the correct tense or form of the verbs in brackets.

25. At 10 o’clock tomorrow he (work) _____________________ in his office.

26. My father (visit) ____________________ to Ha Long Bay next week.

27. There used __________ (be) a cinema here but it was knocked down a few years ago.
28. Harvard (consider) ___________the oldest university in the USA.

29.At 5 o’clock tomorrow Nam (play) ________________________football with his friends.

30.They (build) _____________________ their house this time next week.

31. When I was young, I used to___(swim) everyday.

32. The Great Wall in China (build)_________many centuries ago.