Đọc và trả lời câu hỏi

`1.` The world's first computer was made in `1946` at the University of Pennsylvania

`-` DC: The world's first computer was made at the University of Pennsylvania in `1946`

`2.` Computers were commercially sold for the first time in the `1950s`

`-` DC: Computers were sold commercially for the first time in the `1950s`

`3.` Computers can be used in many fields, such as business, science, medicine, and education

`-` DC: Computers are used in many fields—in business, science, medicine, education and so on

`4.` Computers are very useful nowadays because they help us much in our work and they are playing a big part in our lives

`-` DC: Computers help us much in our work and they are playing a big part in our lives

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