Fill in the blanks choosing the correct forms of the verbs given within brackets We put a slice of lemon into a cup of strong tea and the tea_______ (become) pale. We strike a match and a stick of wood ______(burst) into flame and _____(turn) into charcoal. These _____(be) all chemical reactions. The primeval man who______ (learn) to light a fire was the first chemist. He_______ (accomplish) the first chemical reaction, that of combustion. And this reaction is most necessary, the most important in the history of mankind. It ______(give) our distant ancestors the heat to warm their dwellings on cold days. In our time it______ (open) the way to outer space by propelling rockets weighing many tons into the sky.
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We put a slice of lemon into a cup of strong tea and the tea becomes (become) pale. We strike a match and a stick of wood bursts (burst) into flame and turns (turn) into charcoal. These are (be) all chemical reactions. The primeval man who learnt (learn) to light a fire was the first chemist. He accomplished (accomplish) the first chemical reaction, that of combustion. And this reaction is most necessary, the most important in the history of mankind. It gave (give) our distant ancestors the heat to warm their dwellings on cold days. In our time it opens (open) the way to outer space by propelling rockets weighing many tons into the sky.
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