Experiments of this kind __________ in both the U. S. and Europe well before the Second World War.
265. Which of the following does not belong to the same category?
264. The invention of the coal-burning_______engine revolutionized industrial production in the 18th century and opened the way to the development of mechanized transport by rail and sea.
263. The bank is equipped with new alarm _____. We can say it’s safe and reliable completely.
262. Please write me a 200-300-word_____ of this long report to read.
261. It took Susan weeks to regain her _________ after a bad _________.