Выбрать students were having/had/did have a party when the doorbell nobody rang/was ringing/were ringing it because everybody were dancing/danced/was dancing so when peter finally opened the door, a very angry policeman were entering/was entering/entered 30

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Объяснение:

Основные правила образования множественного числа в английском языке

Можно лучший ответ

While the overall world of robotics is expanding, a robot has some consistent characteristics:

1.Robots all consist of some sort of mechanical construction. The mechanical aspect of a robot helps it complete tasks in the environment for which it’s designed. For example, the Mars 2020 Rovers wheels are individually motorized and made of titanium tubing that help it firmly grip the harsh terrain of the red planet.

2.Robots need electrical components that control and power the machinery. Essentially, an electric current (a battery, for example) is needed to power a large majority of robots.

3.Robots contain at least some level of computer programming. Without a set of code telling it what to do, a robot would just be another piece of simple machinery. Inserting a program into a robot gives it the ability to know when and how to carry out a task.

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