The bicycle as we know it today was originally developed as the "safety bicycle", because other bikes ____ were extremely dangerous.
A. at the time
B. at a time
C. for a time
D. for the time
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Đáp án đúng là: A
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The first American ____ the propelling of a boat by steam was William Henry, a gunsmith of Lancaster, Pennsylvania.
Ever since the first prehistoric stone tools, ____ have lived in a world shaped by invention.
The key ____ inventive success often requires being in the right place at the right time.
The late 1800s and early 1900s ____ excitement over a wide array of inventions and developments.
The carbon dioxide gas given ____ by the fermenting vat was known as "fixed air".
Mark the letter A, B, C, or D to indicate the correct answer
In 1886 in the United States, a pharmacist named Dr. John Pemberton tried to invent a medicine because he wanted a cure for ____.
A patent invention is protected by law ____ only particular people or companies have the right to make or sell it.
An invention developed ____ one purpose will sometimes find use in entirely different circumstances.
The earliest computers were developed during World War II for processing ballistic numbers and numeric analytics, but the thought of having machines ____ difficult mathematics can be traced back to England in the years around 1800.
Some inventions make bigger impact on the public than ____, and some inventions quickly become part of everyday life.
The invention of printing on paper provided a technology ____ which information could be stored over the long term.
Ever ____ the invention of the hydrogen bomb, attempts have been made to harness the power of nuclear fusion for peaceful purposes.
It's hard to credit just one person with the invention of television, but it's indisputable that John Logie Baird was the first to transmit moving pictures.
The European Patent Convention, which was implemented in 1977, created a European Patent Office that can issue ____ European patent.
It is the classical Athenians who can probably lay claim ____ the invention of commercial advertising as we know it today.
