Tom was the first to react.

Source: Tatoeba

Who first reached the summit of Mt. Everest?

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Vikings 1 and 2 became the first space probes to successfully land on the surface of Mars.

Source: Tatoeba

Tom was the first to arrive and the last to leave.

Source: Tatoeba

Nancy was the first girl to come.

Source: Tatoeba

We'll probably be the first ones there.

Source: Tatoeba