The question is based on the following text. The idea that red means stop and green means go has impacted our lives in more ways than just traffic signals. We (1) ... from a young age that the colour red means danger and green means it is okay to move forward. But why were those particular colours chosen for traffic lights in the first place? For something we have to look at everyday, why couldn’t they have been prettier colours like magenta and turquoise? Well, it is important (2) ...that before traffic lights for cars even became a thing, there were traffic signals for trains. (3) ...railroad companies used red to mean stop, white to mean go, and green to mean caution. As you could imagine, train conductors ran into a few problems with white (4) ... go, for instance, one train conductor mistook a bright star (5) ... a white light and thought he was all clear. (6) ... such incidences, railway companies eventually moved green meaning go and it has been that way ever since. The correct words to fill in the blank no (1) are ....

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The question is based on the following text.

The idea that red means stop and green means go has impacted our lives in more ways than just traffic signals. We (1) ... from a young age that the colour red means danger and green means it is okay to move forward. But why were those particular colours chosen for traffic lights in the first place? For something we have to look at everyday, why couldn’t they have been prettier colours like magenta and turquoise? $\;$

Well, it is important (2) ... that before traffic lights for cars even became a thing, there were traffic signals for trains. (3) ... railroad companies used red to mean stop, white to mean go, and green to mean caution. As you could imagine, train conductors ran into a few problems with white (4) ... go, for instance, one train conductor mistook a bright star (5) ... a white light and thought he was all clear. (6) ... such incidences, railway companies eventually moved green meaning go and it has been that way ever since. space

The correct words to fill in the blank no (1) are .... space

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