GLASS

Perhaps (0) __one__of the commonest man-made substances is glass. In fact, it is (16)
__________________ common that few people appreciate its unique qualities. Glass is (17)
__________________ hard and transparent. It does not expand when heated, it is a very poor
conductor and it is resistant to all acids (18) __________________ hydrofluoric acid, which
dissolves it.
(19) __________________ knows exactly where or when the manufacture of glass began. (20)
__________________ is known, though, is that there were skilled glass makers in ancient Egypt
who practised it as (21) __________________ as 2000 BC, if not earlier. The Romans are also
known to (22) __________________ been particularly good (23) __________________ making
glass.
Glass is (24) __________________ from sand, an alkali and other ingredients which can (25)
__________________ colour it or change its properties. These changes are usually achieved (26)
__________________ adding certain chemicals during the process or placing thin layers of other
substances (27) __________________ two sheets of glass. The nature of the glass produced also
depends (28) __________________ the quality of the ingredients used.
Nowadays, one of the main uses of glass is in windows, which to us would seem to (29)
__________________ quite logical. However, the art of making glass was known long (30)
__________________ it was considered suitable for windows.

Mik Can GAP CAM ON RAT NHIEU

For questions 6-30, read the text below and think of the word which best fits each space.
Use only one word in each space. There is an example at the beginning (0).

GLASS

Perhaps (0) __one__of the commonest man-made substances is glass. In fact, it is (16)
__________________ common that few people appreciate its unique qualities. Glass is (17)
__________________ hard and transparent. It does not expand when heated, it is a very poor
conductor and it is resistant to all acids (18) __________________ hydrofluoric acid, which
dissolves it.
(19) __________________ knows exactly where or when the manufacture of glass began. (20)
__________________ is known, though, is that there were skilled glass makers in ancient Egypt
who practised it as (21) __________________ as 2000 BC, if not earlier. The Romans are also
known to (22) __________________ been particularly good (23) __________________ making
glass.
Glass is (24) __________________ from sand, an alkali and other ingredients which can (25)
__________________ colour it or change its properties. These changes are usually achieved (26)
__________________ adding certain chemicals during the process or placing thin layers of other
substances (27) __________________ two sheets of glass. The nature of the glass produced also
depends (28) __________________ the quality of the ingredients used.
Nowadays, one of the main uses of glass is in windows, which to us would seem to (29)
__________________ quite logical. However, the art of making glass was known long (30)
__________________ it was considered suitable for windows.

Mik Can GAP CAM ON RAT NHIEU

Read the passage and choose the best answer.

You can recycle many types of glass. Glass food and beverage containers can be reused and recycled many times. (In fact, only bulbs, ceramic glass, dishes and window glass can’t be recycled.)

Glass is made from soda ash, sand and lime. If it’s thrown away, it stays there indefinitely because glass never breaks down into its original ingredients. To be recycled, glass is sorted by color, crushed into small pieces and melted down into a liquid. Then, it is molded into new glass containers.

When people recycle glass, they ………………..

A. sort it by color and crush it into small pieces

B. melt it into containers

C. mold it into containers

D. all are correct

Read the passage and choose the best answer.

You can recycle many types of glass. Glass food and beverage containers can be reused and recycled many times. (In fact, only bulbs, ceramic glass, dishes and window glass can’t be recycled.)

Glass is made from soda ash, sand and lime. If it’s thrown away, it stays there indefinitely because glass never breaks down into its original ingredients. To be recycled, glass is sorted by color, crushed into small pieces and melted down into a liquid. Then, it is molded into new glass containers.

What does the word “its” in line 5 refer to?

A. glass

B. dash

C. sand

D. lime

Read the passage and choose the best answer.

You can recycle many types of glass. Glass food and beverage containers can be reused and recycled many times. (In fact, only bulbs, ceramic glass, dishes and window glass can’t be recycled.)

Glass is made from soda ash, sand and lime. If it’s thrown away, it stays there indefinitely because glass never breaks down into its original ingredients. To be recycled, glass is sorted by color, crushed into small pieces and melted down into a liquid. Then, it is molded into new glass containers.

Glass ………………….

A. is made from soda ash, sand and lime

B. stays there indefinitely if it’s thrown away

C. never breaks down into its original ingredients

D. all are correct

Read the passage and choose the best answer.

You can recycle many types of glass. Glass food and beverage containers can be reused and recycled many times. (In fact, only bulbs, ceramic glass, dishes and window glass can’t be recycled.)

Glass is made from soda ash, sand and lime. If it’s thrown away, it stays there indefinitely because glass never breaks down into its original ingredients. To be recycled, glass is sorted by color, crushed into small pieces and melted down into a liquid. Then, it is molded into new glass containers.

What does the word “reused” in line 2 mean?

A. use something again.

B. use all of thing

C. throw something away

D. not buying things which are over packed

Read the passage and choose the best answer.

You can recycle many types of glass. Glass food and beverage containers can be reused and recycled many times. (In fact, only bulbs, ceramic glass, dishes and window glass can’t be recycled.)

Glass is made from soda ash, sand and lime. If it’s thrown away, it stays there indefinitely because glass never breaks down into its original ingredients. To be recycled, glass is sorted by color, crushed into small pieces and melted down into a liquid. Then, it is molded into new glass containers.

Which of the following can be recycled?

A. glass food and beverage containers

B. bulbs

C. dishes and window glass

D. ceramic glass

Read the following passage and then choose the best answer A, B, C or D.

          Glass is a remarkable substance made from simplest raw materials. It can be colored or colorless, monochrome or polychrome, transparent, translucent or opaque. It is lightweight impermeable to liquids, readily cleaned and reused, durable yet fragile, and often very beautiful. Glass can be decorated in multiple ways and its optical properties are exceptional. In all its myriad forms-as table ware, containers, in architecture and design-glass represents a major achievement in the history of technological developments.

          Since the Bronze Age about 3,000 B.C, glass has been used for making various kinds of objects. It was first made from a mixture of silica, line and an alkali such as soda or potash, and these remained the basic ingredients of glass until the development of lead glass in the seventeenth century. When heated, the mixture becomes soft, and malleable and can be formed by various techniques into a vast array of shapes and sizes. The homogeneous mass is thus formed by melting then cooling to create glass, but in contrast to most materials formed in this way (metals, for instance), glass lacks the crystalline structure normally associated with solids, and instead retains the random molecular structure of a liquid. In effect, as molten glass cools, it progressively stiffens until rigid, but does so without setting up a network of interlocking crystals customarily associated with that process. This is why glass shatters so easily when dealt a blow, why glass deteriorates over time, especially when exposed to moisture, and why glassware must be slowly reheated and uniformly cooled after manufacture to release internal stresses induced by uneven cooling.

Another unusual feature of glass is the manner in which its viscosity changes as it turns from a cold substance into a hot, ductile liquid. Unlike metals that flow or “freeze” at specific temperatures, glass progressively softens as the temperature rises, going through varying stages of malleability until it flows like a thick syrup. Each stage of malleability allows the glass to be manipulated into various forms, by different techniques, and if suddenly cooled the object retains the stage achieved at that point. Glass is thus amenable to a greater number of heat-forming techniques than most other materials

According the passage, how is glass that has cooled and become rigid different from most other rigid substances?

A. It has varying physical properties

B. It has an interlocking crystal network

C. It has unusually low melting temperature

D. It has a random molecular structure

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

        Glass is a remarkable substance made from the simplest raw materials. It can be colored or colorless, monochrome or polychrome, transparent, translucent, or opaque. It is lightweight impermeable to liquids, readily cleaned and reused, durable yet fragile, and often very beautiful. Glass can be decorated in multiple ways and its optical properties are exceptional. In all its myriad forms - as table ware, containers, in architecture and design - glass represents a major achievement in the history of technological developments.

        Since the Bronze Age about 3, 000 B.C., glass has been used for making various kinds of objects. It was first made from a mixture of silica, line and an alkali such as soda or potash, and these remained the basic ingredients of glass until the development of lead glass in the seventeenth century. When heated, the mixture becomes soft and malleable and can be formed by various techniques into a vast array of shapes and sizes. The homogeneous mass thus formed by melting then cools to create glass, but in contrast to most materials formed in this way (metals, for instance), glass lacks the crystalline structure normally associated with solids, and instead retains the random molecular structure of a liquid. In effect, as molten glass cools, it progressively stiffens until rigid, but does so without setting up a network of interlocking crystals customarilyassociated with that process. This is why glass shatters so easily when dealt a blow. Why glass deteriorates over time, especially when exposed to moisture, and why glassware must be slowly reheated and uniformly cooled after manufacture to release internal stresses induced by uneven cooling.

         Another unusual feature of glass is the manner in which its viscosity changes as it turns from a cold substance into a hot, ductile liquid. Unlike metals that flow or freeze at specific temperatures glass progressively softens as the temperature rises, going through varying stages of malleability until it flows like thick syrup. Each stage of malleability allows the glass to be manipulated into various forms, by different techniques, and if suddenly cooled the object retains the shape achieved at that point. Glass is thus amenable to a greater number of heat-forming techniques than most other materials.

According to the passage, how is glass that has cooled and become rigid different from most other rigid substances?

A. It has an interlocking crystal network

B. It has an unusually low melting temperature

C. It has varying physical properties

D. It has a random molecular structure

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 38 to 42.

  Glass is a remarkable substance made from the simplest raw materials. It can be colored or colorless, monochrome or polychrome, transparent, translucent, or opaque. It is lightweight impermeable to liquids, readily cleaned and reused, durable yet fragile, and often very beautiful Glass can be decorated in multiple ways and its optical properties are exceptional. In all its myriad forms - as table ware, containers, in architecture and design – glass represents a major achievement in the history of technological developments.

  Since the Bronze Age about 3,000 B.C., glass has been used for making various kinds of objects. It was first made from a mixture of silica, line and an alkali such as soda or potash, and these remained the basic ingredients of glass until the development of lead glass in the seventeenth century. When heated, the mixture becomes soft and malleable and can be formed by various techniques into a vast array of shapes and sizes. The homogeneous mass thus formed by melting then cools to create glass, but in contrast to most materials formed in this way (metals, for instance), glass lacks the crystalline structure normally associated with solids, and instead retains the random molecular structure of a liquid. In effect, as molten glass cools, it progressively stiffens until rigid, but does so without setting up a network of interlocking crystals customarily associated with that process. This is why glass shatters so easily when dealt a blow. Why glass deteriorates over time, especially when exposed to moisture, and why glassware must be slowly reheated and uniformly cooled after manufacture to release internal stresses induced by uneven cooling.

  Another unusual feature of glass is the manner in which its viscosity changes as it turns from a cold substance into a hot, ductile liquid. Unlike metals that flow or “freeze” at specific temperatures glass progressively softens as the temperature rises, going through varying stages of malleability until it flows like a thick syrup. Each stage of malleability allows the glass to be manipulated into various forms, by different techniques, and if suddenly cooled the object retains the shape achieved at that point. Glass is thus amenable to a greater number of heat-forming techniques than most other materials.

According to the passage, how is glass that has cooled and become rigid different from most other rigid substances?

A. It has an interlocking crystal network. 

B. It has an unusually low melting temperature. 

C. It has varying physical properties. 

D. It has a random molecular structure.